question_answer1) A cut diamond sparkles because of its [NCERT 1974; RPET 1996; AFMC 2005]
A) Hardness done clear
B) High refractive index done clear
C) Emission of light by the diamond done clear
D) Absorption of light by the diamond done clear
View Solution play_arrowA) He must direct the beam vertically upwards done clear
B) He has to direct the beam horizontally done clear
C) He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection done clear
D) He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection done clear
View Solution play_arrowA) Mercury light done clear
B) Sunlight done clear
C) Infrared light done clear
D) Ultraviolet light done clear
View Solution play_arrowA) Red done clear
B) Green done clear
C) Yellow done clear
D) Violet done clear
View Solution play_arrowA) \[60{}^\circ \] done clear
B) \[45{}^\circ \] done clear
C) \[30{}^\circ \] done clear
D) \[15{}^\circ \] done clear
View Solution play_arrowA) \[\theta ={{49}^{o}}\] done clear
B) \[\theta ={{90}^{o}}\] done clear
C) \[\theta ={{98}^{o}}\] done clear
D) \[\theta =24\frac{{{1}^{o}}}{2}\] done clear
View Solution play_arrowA) \[3\times {{10}^{8}}\] m/s done clear
B) \[1.5\times {{10}^{8}}\] m/s done clear
C) \[6\times {{10}^{8}}\] m/s done clear
D) \[\sqrt{3}\times {{10}^{8}}\]m/s done clear
View Solution play_arrowA) \[{{\sin }^{-1}}(\sin \,r)\] done clear
B) \[{{\sin }^{-1}}\,(\tan r')\] done clear
C) \[{{\sin }^{-1}}\,(\tan i)\] done clear
D) \[{{\tan }^{-1}}(\sin i)\] done clear
View Solution play_arrowA) \[\frac{1}{\sin i}<\mu \] done clear
B) \[\frac{1}{\sin i}>\mu \] done clear
C) \[\sin i<\mu \] done clear
D) \[\sin i>\mu \] done clear
View Solution play_arrowA) Air to glass done clear
B) Vacuum to air done clear
C) Air to water done clear
D) Water to air done clear
View Solution play_arrowA) Ray goes from denser medium to rarer medium and \[i<{{i}_{c}}\] done clear
B) Ray goes from denser medium to rarer medium and \[i>{{i}_{c}}\] done clear
C) Ray goes from rarer medium to denser medium and \[i>{{i}_{c}}\] done clear
D) Ray goes from rarer medium to denser medium and \[i<{{i}_{c}}\] done clear
View Solution play_arrowA) \[{{\sin }^{-1}}(4/3)\] done clear
B) \[{{\tan }^{-1}}(4/3)\] done clear
C) \[{{\sin }^{-1}}(3/4)\] done clear
D) 90? done clear
View Solution play_arrowA) \[0{}^\circ \] done clear
B) \[57{}^\circ \] done clear
C) \[90{}^\circ \] done clear
D) \[180{}^\circ \] done clear
View Solution play_arrowquestion_answer14) The critical angle for diamond (refractive index = 2) is [MP PET 2003]
A) \[20{}^\circ \] done clear
B) \[60{}^\circ \] done clear
C) \[45{}^\circ \] done clear
D) \[30{}^\circ \] done clear
View Solution play_arrowquestion_answer15) The reason for shining of air bubble in water is [MP PET 1997; KCET 1999]
A) Diffraction of light done clear
B) Dispersion of light done clear
C) Scattering of light done clear
D) Total internal reflection of light done clear
View Solution play_arrowA) \[\theta \] done clear
B) More than \[\theta \] done clear
C) Less than \[\theta \] done clear
D) \[\frac{\theta {{\lambda }_{1}}}{{{\lambda }_{2}}}\] done clear
View Solution play_arrowquestion_answer17) 'Mirage' is a phenomenon due to [AIIMS 1998; MP PET 2002; AFMC 2003]
A) Reflection of light done clear
B) Refraction of light done clear
C) Total internal reflection of light done clear
D) Diffraction of light done clear
View Solution play_arrowA) 1.3 done clear
B) 1.4 done clear
C) 1.5 done clear
D) 1.6 done clear
View Solution play_arrowA) Equal to the angle of reflection done clear
B) The angle between the refracted ray and the normal done clear
C) The angle of incidence for which the refracted ray travels along the glass-air boundary done clear
D) The angle of incidence done clear
View Solution play_arrowA) Refraction done clear
B) Interference done clear
C) Polarization done clear
D) Total internal reflection done clear
View Solution play_arrowA) \[{{\sin }^{-1}}\frac{4}{5}\] done clear
B) \[{{\sin }^{-1}}\frac{5}{4}\] done clear
C) \[{{\sin }^{-1}}\]\[\frac{1}{2}\] done clear
D) \[{{\sin }^{-1}}\frac{2}{1}\] done clear
View Solution play_arrowquestion_answer22) Total internal reflection is possible when light rays travel [RPMT 1999]
A) Air to water done clear
B) Air to glass done clear
C) Glass to water done clear
D) Water to glass done clear
View Solution play_arrowA) \[{{15}^{o}}\] done clear
B) \[{{30}^{o}}\] done clear
C) \[{{45}^{o}}\] done clear
D) \[{{60}^{o}}\] done clear
View Solution play_arrowA) sin?1(1/2) done clear
B) \[{{\sin }^{-1}}\left( \frac{\sqrt{8}}{9} \right)\] done clear
C) \[{{\sin }^{-1}}(8/9)\] done clear
D) \[{{\sin }^{-1}}(5/7)\] done clear
View Solution play_arrowA) Cw > Cg done clear
B) Cw < Cg done clear
C) Cw = Cg done clear
D) Cw = Cg = 0 done clear
View Solution play_arrowA) 1.0 done clear
B) 1.5 done clear
C) 2.0 done clear
D) 2.5 done clear
View Solution play_arrowA) \[{{49}^{o}}\] to the horizontal done clear
B) \[{{90}^{o}}\] with the vertical done clear
C) \[{{49}^{o}}\] to the vertical done clear
D) Along the horizontal done clear
View Solution play_arrowquestion_answer28) Optical fibres are related with [AFMC 2002]
A) Communication done clear
B) Light done clear
C) Computer done clear
D) None of these done clear
View Solution play_arrowquestion_answer29) Brilliance of diamond is due to [AIIMS 2002; MP PMT 2003]
A) Shape done clear
B) Cutting done clear
C) Reflection done clear
D) Total internal reflection done clear
View Solution play_arrowA) 3.33 m sec done clear
B) 6.67 m sec done clear
C) 5.77 m sec done clear
D) 3.85 m sec done clear
View Solution play_arrowA) \[{{30}^{o}}\] done clear
B) \[{{60}^{o}}\] done clear
C) \[{{45}^{o}}\] done clear
D) \[{{90}^{o}}\] done clear
View Solution play_arrowA) Optical fibres may have homogeneous core with a suitable cladding done clear
B) Optical fibres can be of graded refractive index done clear
C) Optical fibres are subject to electromagnetic interference from outside done clear
D) Optical fibres have extremely low transmission loss done clear
View Solution play_arrowA) \[\frac{2}{\sqrt{3}}\] done clear
B) \[\frac{\sqrt{2}}{3}\] done clear
C) \[\sqrt{3}\] done clear
D) \[\frac{\sqrt{3}}{2}\] done clear
View Solution play_arrowA) \[{{\sin }^{-1}}\left( \frac{1}{\sqrt{\mu }} \right)\] done clear
B) \[{{90}^{o}}\] done clear
C) \[{{\sin }^{-1}}\left( \frac{1}{{{\mu }^{2}}} \right)\] done clear
D) \[{{\sin }^{-1}}\left( \frac{1}{\mu } \right)\] done clear
View Solution play_arrowA) Yellow, orange, red done clear
B) Violet, indigo, blue done clear
C) All colours done clear
D) All colours except green done clear
View Solution play_arrowA) (i) and (iii) done clear
B) (i) and (iv) done clear
C) (ii) and (iii) done clear
D) (ii) and (iv) done clear
View Solution play_arrowA) \[\frac{\sqrt{2}+1}{2}\] done clear
B) \[\sqrt{\frac{3}{2}}\] done clear
C) \[\sqrt{\frac{1}{2}}\] done clear
D) \[\sqrt{2}+1\] done clear
View Solution play_arrowA) \[v(1-\cos \theta )\] done clear
B) \[v/\sin \theta \] done clear
C) \[v/\cos \theta \] done clear
D) \[v(1-\sin \theta )\] done clear
View Solution play_arrowA) \[{{\tan }^{-1}}\left( \frac{{{t}_{1}}}{{{t}_{2}}} \right)\] done clear
B) \[{{\sin }^{-1}}\left( \frac{{{t}_{1}}}{{{t}_{2}}} \right)\] done clear
C) \[{{\sin }^{-1}}\left( \frac{10{{t}_{1}}}{{{t}_{2}}} \right)\] done clear
D) \[{{\tan }^{-1}}\left( \frac{10{{t}_{1}}}{{{t}_{2}}} \right)\] done clear
View Solution play_arrowA) 1.41 done clear
B) 1.2 done clear
C) 1.5 done clear
D) 2 done clear
View Solution play_arrowA) Refraction done clear
B) Reflection done clear
C) Total internal reflection done clear
D) Dispersion done clear
View Solution play_arrowA) \[{{45}^{o}}\] done clear
B) \[{{90}^{o}}\] done clear
C) \[{{65}^{o}}\] done clear
D) \[{{43.2}^{o}}\] done clear
View Solution play_arrowA) \[{{90}^{o}}\] done clear
B) Greater than critical angle done clear
C) Equal to critical angle done clear
D) \[{{0}^{o}}\] done clear
View Solution play_arrowA) \[36\sqrt{5}\] done clear
B) \[4\sqrt{5}\] done clear
C) \[36\sqrt{7}\] done clear
D) \[36/\sqrt{7}\] done clear
View Solution play_arrowA) 2 m done clear
B) 6 m done clear
C) 4 m done clear
D) 3 m done clear
View Solution play_arrowA) 3.0 cm done clear
B) 4.0 cm done clear
C) 4.5 cm done clear
D) 5.0 cm done clear
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