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The net angular dispersion without deviation is equal to,

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Important Questions on Ray Optics

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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 19
When a glass prism of refracting angle 60° is immersed in a liquid, its angle of minimum deviation is 30°. The critical angle of glass prism with respect to the liquid medium is
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 20
A thin prism having refracting angle 10° is made of glass of refractive index 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of the second prism should be:
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 21
A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from opposite surface. If the refractive index of the material of prism is μ, the angle of incidence i is nearly equal to
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 22
A point source of light is placed 4 m below the surface of water of refractive index 53. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off all light coming out of water is
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 23
The refractive index of a material of a prism of angles 45°-45°-90° is 1.5. The path of the ray of light incident normally on the hypotenuse side is shown in the figure.
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 24
A point source of light is placed at the bottom of a vessel which is filled with water of refractive index μ to a height h. If a floating opaque disc has to be placed exactly above it so that the source is invisible from above, the radius of the disc should be
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 2>Q 25
On a bright sunny day, a diver of height h stands at the bottom of a lake of depth H. Looking upward, he can see objects outside the lake in a circular region of radius R. Beyond this circle he sees the images of objects lying on the floor of the lake. If refractive index of waler is 43, then the value of R is :
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Physics Crash Course JEE Main>Chapter 18 - Ray Optics>Level 3>Q 10
A ray of light incident on a glass sphere (refractive index 3) suffers total internal reflection before emerging but exactly parallel to the incident ray. The angle of incidence was