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

MCQ Questions for Class 12 Physics Chapter 9 Download Free PDF: CBSE RBSE and NCERT Physics class 12 MCQs for Chapter 9 “Optics and Optical Instruments” is very important for the students who want to get good marks. Neet MCQs

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

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

(a) Concave lens
(b) Concave mirror
(d) Convex mirror
(d) Both (a) and (c)

(d) Both (a) and (c)

Q2. 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

(a) 10 cm
(b) 20 cm
(c) 40 cm
(d) infinity

(c) 40 cm

Q3. 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

(a) 30° for both the colors
(b) greater for the violet color
(c) greater for the red color
(d) equal but not 30° for both the colors

(a) 30° for both the colors

Q4. Which of the following colours of white light deviated most when passes through a prism?

(a) Red light
(b) Violet light
(c) Yellow light
(d) Both (a) and (b)

(b) Violet light

Q5. An under-water swimmer cannot see very clearly even in absolutely clear water because of

(a) absorption of light in water
(b) scattering of light in water
(c) reduction of speed of light in water
(d) change in the focal length of eye lens

(d) change in the focal length of eye lens

Q6. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then

(a) the magnification is 1000
(b) the length of the telescope tube is 20.02 m
(c) the image formed of inverted
(d) all of these

(d) all of these

Q7. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 ’em in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is

(a) 10 cm
(b) 15 cm
(c) 2.5 cm
(d) 5 cm

(d) 5 cm

Q8. For a total internal reflection, which of the following is correct?

(a) Light travels from rarer to denser medium.
(b) Light travels from denser to rarer medium.
(c) Light travels in air only.
(d) Light travels in water only.

(b) Light travels from denser to rarer medium.

Q9. Mirage is a phenomenon due to

(a) refraction of light
(b) reflection of light
(c) total internal reflection of light
(d) diffraction of light.

(c) total internal reflection of light

Q10. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then

(a) the magnification is 1000
(b) the length of the telescope tube is 20.02 m
(c) the image formed of inverted
(d) all of these

(d) all of these

Q11. 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

(a) become zero
(b) become infinite
(c) become small, but non-zero
(d) remain unchanged

(b) become infinite

Q12. Which of the following forms a virtual and erect image for all positions of the object?

(a) Concave lens
(b) Concave mirror
(d) Convex mirror
(d) Both (a) and (c)

(d) Both (a) and (c)

Q13. 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

(a) 10 cm
(b) 20 cm
(c) 40 cm
(d) infinity

(c) 40 cm

Q14. 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

(a) 30° for both the colors
(b) greater for the violet color
(c) greater for the red color
(d) equal but not 30° for both the colors

(a) 30° for both the colors

Q15. Which of the following cannot be polarised?

(b) transverse waves
(c) sound waves
(d) X-rays

(c) sound waves

Q16. Light year is the unit of:

(a) distance
(b) time
(c) intensity of light
(d) None of these

(a) distance

Q17. The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:

(a) geometrical optics
(b) physical optics
(c) corpuscular optics
(d) quantum optics

(d) quantum optics

Q18. When light travels from one medium to another, which of the following does not change?

(a) frequency
(b) refractive index
(c) velocity
(d) wavelength

(a) frequency

Q19. You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

(a) The beam of red light would undergo total internal reflection.
(b) The beam of red light would bend towards normal while it gets refracted through the second medium.
(c) The beam of blue light would undergo total internal reflection.
(d) The beam of green light would bend away from the normal as it gets refracted through the second medium.

(c) The beam of blue light would undergo total internal reflection.

Q20. 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?

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

(b) The magnification is 1000.

Q21. 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:

(a) 30 cm away from the mirror
(b) 36 cm away from the mirror
(c) 30 cm towards the mirror
(d) 36 cm towards the mirror

(b) 36 cm away from the mirror

Q22. The refractive index of the material of a prism is √2 and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is:

(a) 60°
(b) 45°
(c) 30°
(d) zero

(b) 45°

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