A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm . If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of :

20 cm from the plane mirror, it would be a virtual image.

20 cm from the lens, it would be a real image.

30 cm from the lens, it would be a real image.

30 cm from the plane mirror, it would be a virtual image.

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

a large aperture contributes to the quality and visibility of the images.

a large area of the objective ensures better light gathering power.

a large aperture provides a better resolution.

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Two similar thin equi-convex lenses of focal length $f$ each are kept coaxially in contact with each other, such that the focal length of the combination is $F_{1} .$ When the space between the two lenses is filled with glycerin (which has the same refractive index ( $μ = 1.5$ ) as that of glass), then the equivalent focal length is $F_{2} .$ The ratio $F_{1} : F_{2}$ will be

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Important Questions on Ray Optics

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 5th May 2019>Q 14

In total internal reflection, when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 6th May 2018>Q 15

The refractive index of the material of a prism is

\sqrt{2}

and the angle of the prism is

30^{o} .

One of the two refracting surface 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

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 6th May 2018>Q 16

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

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 7th May 2017>Q 17

A thin prism having refracting angle

10^{o}

is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 7th May 2017>Q 18

A beam of light from a source

L

is incident normally on a plane mirror fixed at a certain distance

x

from the source. The beam is reflected back as a spot on a scale placed just above the source

L

. When the mirror is rotated through a small angle

θ

, the spot of the light is found to move through a distance

y

on the scale. The angle

θ

is given by

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 24th July 2016>Q 19

Two identical glass

(μ_{g} = \frac{3}{2})

equiconvex lenses of focal length,

f

are kept in contact. The space between the two lenses is filled with water

(μ_{w} = \frac{4}{3})

. The focal length of the combination is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 24th July 2016>Q 20

An air bubble in a glass slab with refractive index

1.5

(near-normal incidence) is

5 cm

deep when viewed from one surface and

3 cm

deep when viewed from the opposite face. The thickness (in

cm

) of the slab is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 17 - Ray Optics>NEET - 24th July 2016>Q 21

A person can see clearly object only when they lie between

50 cm

400 cm

from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

Important Questions on Ray Optics

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