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.


NCERT MCQ Chapters for Class 12 Physics

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?

(i) radiowaves
(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


Q8. Ashort pulse of white light is incident from air to a glass slab atnormal incidence. After travelling through the slab, the first colour to emerge is

(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


Q10. Two concave mirrors have the same focal length but the aperture of one is larger than that of the other. Which mirror forms the sharper image and why?

(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.


Q17. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to w ater is:

(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


Q19. Two lenses of focal lengths 20 cm and – 40 cm are held in contact. The image of an object at infinity will be formed by the combination at

(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


Q25. A person is six feet tall. How tall must a plane mirror be if he is able to see his entire length?

(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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