Class 12 Physics - Chapter 9: Ray Optics And Optical Instruments MCQ Questions

9 Questions 18 Minutes

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Your Class 12 Physics Study Path

Question 1

Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object will not look distorted because

A water in a trough acts as a lens and magnifies the object.

B some of the points of the object far away from the edge may not be visible because of total internal reflection.

C the angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.

D the apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.

Question 2

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 36 cm towards the mirror

B 30 cm towards the mirror

C 36 cm away from the mirror

D 30 cm away from the mirror

Question 3

The refractive index of the material of a prism is âˆš2 and the angle of the prism is 30Â°. 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 zero

B 30Â°

C 45Â°

D 60Â°

Question 4

A not be seen at all.

B appear to be at the centre of AD.

C appear to be near D.

D appear to be near A.

Question 5

A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image formed is:

A virtual and at a distance of 40 cm from convergent lens.

B real and at a distance of 40 cm from convergent lens

C real and at a distance of 6 cm from the convergent lens

D real and at a distance of 40 cm from the divergent lens

Question 6

A 4

B 3

C 2

D 1.

Question 7

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 90Â°. 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 green light would bend away from the normal as it gets refracted through the second medium.

B The beam of blue light would undergo total internal reflection.

C The beam of red light would bend towards normal while it gets refracted through the second medium.

D The beam of red light would undergo total internal reflection.

Question 8

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

A red.

B violet.

C green.

D blue.

Question 9

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

B The image formed is inverted.

C The magnification is 1000.

D The length of the telescope tube is 20.02 m.

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