12th Class Physics Ray Optics Question Bank

done Assertion And Reason (MCQs) - Ray Optics and Optical Instruments Total Questions - 10

• question_answer1)

  Directions (Q. No. 1 to 10): In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

  Assertion (A): A convex mirror cannot form real images.

  Reason (R): Convex mirror converges the parallel rays that are incident on it.

   
  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
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• question_answer2)

  Assertion (A): The focal length of a concave mirror ƒ is and an object is placed at a distance x from the focus. The magnification produced by the mirror is ƒf/x.

  Reason (R): magnification = size of image / size of object

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
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• question_answer3)

  Assertion (A): The mirror formula 1/v + 1/u = 1/fƒ is valid for mirrors of small aperture.

  Reason (R): Laws of reflection of light is valid for only plane surface and not for large spherical surface.

   
  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer4)

  Assertion (A): Air bubbles shine in water.

  Reason (R): Air bubbles shine in water due to refraction of light.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer5)

  Assertion (A): A diamond of refractive index \[\sqrt{6}\] is immersed in a liquid of refractive index \[\sqrt{3}\] . If light travels from diamond to liquid, total internal reflection will take place when angle of incidence is \[{{30}^{o}}\].

  Reason (R): µ, = 1/sin C, where µ is the refractive index of diamond with respect to the liquid

   
  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer6)

  Assertion (A): A double convex air bubble is formed within a glass slab. The air bubble behaves like a converging lens.

  Reason (R): Refractive index of glass is more that the refractive index of air.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer7)

  Assertion (A): The scattering of light while passing through a true solution is called Tyndall effect.

  Reason (R): Intensity of scattered light is inversely proportional to the fourth power of wavelength.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer8)

  Assertion (A): A convex lens of focal length 30 cm can't be used as a simple microscope in normal setting.

  Reason (R): For normal setting, the angular magnification of simple microscope is \[\operatorname{M}=\frac{\operatorname{D}}{f}\]

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer9)

  Assertion (A): If the objective lens and the eyepiece lens of a microscope are interchanged, it works as a telescope.

  Reason (R): Objective lens of telescope require large focal length and eyepiece lens require small focal length.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow

• question_answer10)

  Assertion (A): Convex lens behaves like a simple microscope.

  Reason (R): For larger magnifying power, the focal length of convex lens should be small.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is True done clear
  View Solution play_arrow