# Ray Optics and Optical Instruments MCQ Questions for Class 12 Physics Chapter 9 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 9 Ray Optics and Optical Instruments with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Ray Optics and Optical Instruments. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. Which of the following forms a virtual and erect image for all positions of the object?

(i) Concave lens
(ii) Concave mirror
(iv) Convex mirror
(iv) Both (i) and (iii)

(iv) Both (i) and (iii)

## Q2. Which of the following cannot be polarised?

(ii) transverse waves
(iii) sound waves
(iv) X-rays

(iii) sound waves

## Q3. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Which one of the following is not possible?

(i) The length of the telescope tube is 20.02 m.
(ii) The magnification is 1000.
(iii) The image formed is inverted.
(iv) An objective of a larger aperture will increase the brightness and reduce chromatic aberration of the image.

(iv) An objective of a larger aperture will increase the brightness and reduce chromatic aberration of the image.

## Q4. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then

(i) the magnification is 1000
(ii) the length of the telescope tube is 20.02 m
(iii) the image formed of inverted
(iv) all of these

(iv) all of these

## Q5. A concave mirror is held in water. What should be the change in the focal length of the mirror?

(i) Halved
(ii) Doubled
(iii) Remains the same
(iv) Increases exponentially

(iii) Remains the same

## Q6. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

(i) become zero
(ii) become infinite
(iii) become small, but non-zero
(iv) remain unchanged

(ii) become infinite

## Q7. Which of-the following is not a property of light?

(i) It can travel through vacuum
(ii) It has a finite speed
(iii) It requires a material medium for its propagation
(iv) It involve transportation energy

(iii) It requires a material medium for its propagation

(i) blue.
(ii) green.
(iii) violet.
(iv) red.

(iv) red.

## Q9. Mirage is a phenomenon due to

(i) refraction of light
(ii) reflection of light
(iii) total internal reflection of light
(iv) diffraction of light.

(iii) total internal reflection of light

(i) Plane
(ii) Concave
(iii) Convex
(iv) Prism

(ii) Concave

## Q11. Mirage is a phenomenon due to

(i) refraction of light
(ii) reflection of light
(iii) total internal reflection of light
(iv) diffraction of light.

(iii) total internal reflection of light

## Q12. Light year is the unit of:

(i) distance
(ii) time
(iii) intensity of light
(iv) None of these

(i) distance

## Q13. An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be:

(i) 30 cm away from the mirror
(ii) 36 cm away from the mirror
(iii) 30 cm towards the mirror
(iv) 36 cm towards the mirror

(ii) 36 cm away from the mirror

## Q14. For a total internal reflection, which of the following is correct?

(i) Light travels from rarer to denser medium.
(ii) Light travels from denser to rarer medium.
(iii) Light travels in air only.
(iv) Light travels in water only.

(ii) Light travels from denser to rarer medium.

## Q15. A man stands in front of a mirror of special shape. He finds that his image has a very small head, a fat body, and legs of normal size. What can we say about the shapes of the three parts of the mirror?

(i) Convex, Concave, Plane
(ii) The plane, Concave, Convex
(iii) Concave, Convex, Plane
(iv) Convex, Plane, Concave

(i) Convex, Concave, Plane

## Q16. For a total internal reflection, which of the following is correct?

(i) Light travels from rarer to denser medium.
(ii) Light travels from denser to rarer medium.
(iii) Light travels in air only.
(iv) Light travels in water only.

(ii) Light travels from denser to rarer medium.

(i) 8/9
(ii) 9/8
(iii) 7/6
(iv) 2

(ii) 9/8

## Q18. Which of the following colour of white light deviated most when passes through a prism?

(i) Red light
(ii) Violet light
(iii) Yellow light
(iv) Both (i) and (ii)

(ii) Violet light

(i) 10 cm
(ii) 20 cm
(iii) 40 cm
(iv) infinity

(iii) 40 cm

## Q20. A convergent lens will become less convergent in :

(i) oil
(ii) water
(iii) both of (i) and (ii)
(iv) none of these

(ii) water

## Q21. Which of the following forms a virtual and erect image for all positions of the object?

(i) Concave lens
(ii) Concave mirror
(iv) Convex mirror
(iv) Both (i) and (iii)

(iv) Both (i) and (iii)

## Q22. Which of the following causes refraction of light?

(i) Change in the density of light from one medium to another
(ii) Change in viscosity of light from one medium to another
(iii) Change in the speed of light from one medium to another
(iv) Change in direction of light from one medium to another

(iii) Change in the speed of light from one medium to another

## Q23. Two beams of red and violet color are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be

(i) 30° for both the colors
(ii) greater for the violet color
(iii) greater for the red color
(iv) equal but not 30° for both the colors

(i) 30° for both the colors

## Q24. The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:

(i) geometrical optics
(ii) physical optics
(iii) corpuscular optics
(iv) quantum optics

(iv) quantum optics

(i) 3 ft
(ii) 4.5 ft
(iii) 7.5 ft
(iv) 6 ft

(i) 3 ft

## Q26. Identify the factor on which the angle of deviation of the prism does not depend.

(i) The angle of incidence
(ii) The material of the prism
(iii) The angle of reflection
(iv) The wavelength of light used

(iii) The angle of reflection

## Q27. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then

(i) the magnification is 1000
(ii) the length of the telescope tube is 20.02 m
(iii) the image formed of inverted
(iv) all of these

(iv) all of these

## Q28. When light travels from one medium to another, which of the following does not change?

(i) frequency
(ii) refractive index
(iii) velocity
(iv) wavelength

(i) frequency

## Q29. When light is refracted into a medium,

(i) its wavelength and frequency both increase
(ii) its wavelength increases but frequency remains unchanged
(iii) its wavelength decreases but frequency remains unchanged
(iv) its wavelength and frequency both decrease

(ii) its wavelength increases but frequency remains unchanged

## Q30. Which of the following causes dispersion?

(i) Refraction
(ii) Reflection
(iii) Total internal reflection
(iv) Total internal dispersion

(i) Refraction

## Q31. The air bubble inside water shine due to:

(i) Reflection
(ii) Refraction
(iii) T.l.R.
(iv) None of these

(iii) T.l.R.

## Q32. What is the relative refractive index of water with respect to glass?

(i) Unity
(ii) More than unity
(iii) Less than unity
(iv) Zero

(iii) Less than unity

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