Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

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Passage / Comprehension

A hollow cylindrical beam of white light is incident on a converging lens in air. Axis of the beam coincides with the principal axis of the lens. A screen is placed behind the lens.

. If $f_{V}$ is focal length for violet light and $f_{R}$ is focal length for red light, then

Options:

Answer:

Solution:

Violet light is deviated more than red ( $μ_{V} > μ_{R}$ ), so its focal length is shorter: $f_{R} > f_{V}$ . Hence (B).

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at curved surface/Lens

⏱ 2mℹ️ Source: QB

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