JEE Main & Advanced Physics Ray Optics Question Bank

done Plane Mirror Total Questions - 34

• question_answer1)
  Two vertical plane mirrors are inclined at an angle of \[60{}^\circ \] with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is
  A)
             \[60{}^\circ \]                       done clear
  B)
             \[120{}^\circ \] done clear
  C)
             \[180{}^\circ \]                     done clear
  D)
             \[240{}^\circ \] done clear
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• question_answer2)
  A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is  [MP PMT 1997; DCE 2001, 03]
  A)
             Parallel                                    done clear
  B)
             Convergent done clear
  C)
             Divergent                               done clear
  D)
             None of the above done clear
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• question_answer3)
  What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other [KCET 1994; SCRA 1994]
  A)
             \[60{}^\circ \]                       done clear
  B)
             \[90{}^\circ \] done clear
  C)
             \[120{}^\circ \]                     done clear
  D)
             \[175{}^\circ \] done clear
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• question_answer4)
  A plane mirror reflecting a ray of incident light is rotated through an angle \[\theta \] about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then                            [NCERT 1978; CPMT 1991]
  A)
             The reflected ray does not rotate done clear
  B)
             The reflected ray rotates through an angle \[\theta \] done clear
  C)
             The reflected ray rotates through an angle \[2\theta \] done clear
  D)
             The incident ray is fixed done clear
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• question_answer5)
  A plane mirror is approaching you at a speed of \[10\,cm/sec\]You can see your image in it. At what speed will your image approach you                                                                  [CPMT 1974]
  A)
             \[10cm/sec\]                        done clear
  B)
             \[5cm/sec\] done clear
  C)
             \[20cm/sec\]                        done clear
  D)
             \[15cm/sec\] done clear
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• question_answer6)
  A light bulb is placed between two plane mirrors inclined at an angle of \[60{}^\circ .\] The number of images formed are                    [NCERT 1980; CPMT 1996, 97; SCRA 1994; AIIMS 1997; RPMT 1999; AIEEE 2002;  Orissa JEE 2003; MP PMT 2004; MP PET 2004]
  A)
             6     done clear
  B)
             2 done clear
  C)
             5     done clear
  D)
             4 done clear
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• question_answer7)
  It is desired to photograph the image of an object placed at a distance of \[3m\] from the plane mirror. The camera which is at a distance of \[4.5m\] from the mirror should be focussed for a distance of                                    [NCERT 1971]
  A)
             \[3m\]                                     done clear
  B)
             \[4.5m\] done clear
  C)
             \[6m\]                                     done clear
  D)
             \[7.5m\] done clear
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• question_answer8)
  A thick plane mirror shows a number of images of the filament of an electric bulb. Of these, the brightest image is the                                                                         [RPMT 2003]
  A)
             First                                          done clear
  B)
             Second done clear
  C)
             Fourth                                     done clear
  D)
             Last done clear
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• question_answer9)
  A man is \[180cm\] tall and his eyes are \[10cm\] below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of \[1m\] from him. The minimum length of the plane mirror required is [MP PMT 1993; DPMT 2001]
  A)
             \[180cm\]                               done clear
  B)
             \[90cm\] done clear
  C)
             \[85cm\]                                 done clear
  D)
             \[170cm\] done clear
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• question_answer10)
  A person is in a room whose ceiling and two adjacent walls are mirrors. How many images are formed [AFMC 2002]
  A)
             5     done clear
  B)
             6 done clear
  C)
             7     done clear
  D)
             8 done clear
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• question_answer11)
  When a plane mirror is placed horizontally on a level ground at a distance of \[60m\] from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of \[90{}^\circ \] at the eye. The height of the tower will be [CPMT 1984]
  A)
             \[30m\]                                   done clear
  B)
             \[60m\] done clear
  C)
             \[90m\]                                   done clear
  D)
             \[120m\] done clear
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• question_answer12)
  A ray of light incidents on a plane mirror at an angle of \[30{}^\circ .\] The deviation produced in the ray is
  A)
             \[30{}^\circ \]                       done clear
  B)
             \[60{}^\circ \] done clear
  C)
             \[90{}^\circ \]                       done clear
  D)
             \[120{}^\circ \] done clear
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• question_answer13)
  A ray of light is incidenting normally on a plane mirror. The angle of reflection will be                       [MP PET 2000]
  A)
             \[0{}^\circ \]                          done clear
  B)
             \[90{}^\circ \] done clear
  C)
             Will not be reflected          done clear
  D)
             None of the above done clear
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• question_answer14)
  When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to [CPMT 1991; J & KCET 2004]
  A)
             0     done clear
  B)
             \[\frac{\pi }{2}\] done clear
  C)
             \[\pi \]                                     done clear
  D)
             \[2\pi \] done clear
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• question_answer15)
  A ray is reflected in turn by three plain mirrors mutually at right angles to each other. The angle between the incident and the reflected rays is                                                 [Roorkee 1995]
  A)
             \[90{}^\circ \]                       done clear
  B)
             \[60{}^\circ \] done clear
  C)
             \[180{}^\circ \]                     done clear
  D)
             None of these done clear
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• question_answer16)
  Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand       [MP PMT 1995; UPSEAT 2001]
  A)
             None                                        done clear
  B)
             1 done clear
  C)
             2     done clear
  D)
             3 done clear
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• question_answer17)
  When a plane mirror is rotated through an angle \[\theta \]then the reflected ray turns through the angle \[2\theta \] then the size of the image
  A)
             Is doubled                              done clear
  B)
             Is halved done clear
  C)
             Remains the same              done clear
  D)
             Becomes infinite done clear
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• question_answer18)
  A plane mirror produces a magnification of  [MP PET/PMT 1997]
  A)
             \[-1\]                                        done clear
  B)
             \[+1\] done clear
  C)
             Zero                                          done clear
  D)
             Between 0 and \[+\,\,\infty \] done clear
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• question_answer19)
  A plane mirror makes an angle of \[30{}^\circ \] with horizontal. If a vertical ray strikes the mirror, find the angle between mirror and reflected ray                                               [RPET 1997]
  A)
             \[30{}^\circ \]                       done clear
  B)
             \[45{}^\circ \] done clear
  C)
             \[60{}^\circ \]                       done clear
  D)
             \[90{}^\circ \] done clear
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• question_answer20)
  A watch shows time as \[3:25\] when seen through a mirror, time appeared will be         [RPMT 1997; JIPMER 2001, 02]
  A)
             \[8:35\]                                   done clear
  B)
             \[9:35\] done clear
  C)
             \[7:35\]                                   done clear
  D)
             \[8:25\] done clear
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• question_answer21)
  If an observer is walking away from the plane mirror with \[6m/sec.\] Then the velocity of the image with respect to observer will be                                                             [RPMT 1999]
  A)
             \[6m/sec\]                             done clear
  B)
             \[-\,6m/sec\] done clear
  C)
             \[12m/sec\]                          done clear
  D)
             \[3m/sec\] done clear
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• question_answer22)
  A man runs towards mirror at a speed of \[15\,m/s.\]What is the speed of his image                       [CBSE PMT 2000]
  A)
             7.5 m/s                                    done clear
  B)
             15 m/s done clear
  C)
             30 m/s                                     done clear
  D)
             45 m/s done clear
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• question_answer23)
  A small object is placed 10 cm infront of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance focused for your eye will be   [KCET (Engg.) 2001]
  A)
             60 cm                                       done clear
  B)
             20 cm done clear
  C)
             40 cm                                       done clear
  D)
             80 cm done clear
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• question_answer24)
  An object is at a distance of 0.5 m in front of a plane mirror. Distance between the object and image is  [CPMT 2002]
  A)
             0.5 m                                        done clear
  B)
             1 m done clear
  C)
             0.25 m                                      done clear
  D)
             1.5 m done clear
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• question_answer25)
  A man runs towards a mirror at a speed 15 m/s  The speed of the image relative to the man is [Kerala PET 2002]
  A)
             15 \[m{{s}^{-1}}\]               done clear
  B)
             30\[m{{s}^{-1}}\] done clear
  C)
             35 \[m{{s}^{-1}}\]               done clear
  D)
             20\[m{{s}^{-1}}\] done clear
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• question_answer26)
  The light reflected by a plane mirror may form a real image [KCET (Engg. & Med.) 2002]
  A)
             If the rays incident on the mirror are diverging done clear
  B)
             If the rays incident on the mirror are converging done clear
  C)
             If the object is placed very close to the mirror done clear
  D)
             Under no circumstances done clear
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• question_answer27)
  Two plane mirrors are inclined at an angle of \[{{72}^{0}}\]. The number of images of a point object placed between them will be      [KCET (Engg. & Med.)1999; BCECE 2003]
  A)
             2     done clear
  B)
             3 done clear
  C)
             4     done clear
  D)
             5 done clear
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• question_answer28)
  To get three images of a single object, one should have two plane mirrors at an angle of [AIEEE 2003]
  A)
  \[30{}^\circ \]                                     done clear
  B)
  \[60{}^\circ \] done clear
  C)
  \[90{}^\circ \] done clear
  D)
  \[150{}^\circ \] done clear
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• question_answer29)
  A man of length h requires a mirror, to see his own complete image of length at least equal to   [MP PET 2003]
  A)
             \[\frac{h}{4}\]                      done clear
  B)
             \[\frac{h}{3}\] done clear
  C)
             \[\frac{h}{2}\]                      done clear
  D)
             h done clear
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• question_answer30)
  Two plane mirrors are at \[45{}^\circ \] to each other. If an object is placed between them, then the number of images will be  [MP PMT 2003]
  A)
             5     done clear
  B)
             9 done clear
  C)
             7     done clear
  D)
             8 done clear
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• question_answer31)
  A man having height 6 m. He observes image of 2 m height erect, then mirror used is [BCECE 2004]
  A)
             Concave                                  done clear
  B)
             Convex done clear
  C)
             Plane                                        done clear
  D)
             None of these done clear
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• question_answer32)
  A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle                                        [UPSEAT 2004]
  A)
             \[2\theta \]                           done clear
  B)
             \[{{0}^{o}}\] done clear
  C)
             \[\theta \]                              done clear
  D)
             \[4\theta \] done clear
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• question_answer33)
  Focal length of a plane mirror is                              [RPMT 2000]
  A)
             Zero                                          done clear
  B)
             Infinite done clear
  C)
             Very less                                 done clear
  D)
             Indefinite done clear
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• question_answer34)
  A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of [MP PET 2005]
  A)
  \[50{}^\circ \] done clear
  B)
  \[60{}^\circ \] done clear
  C)
  \[70{}^\circ \] done clear
  D)
  \[80{}^\circ \] done clear
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