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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

PhysicsMediumsingle choice

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 the distance between screen and lens is less than both $f_{V}$ and $f_{R}$ pattern obtained on screen will be

Options:

Answer:

Solution:

Since $f_{V} < f_{R}$ , violet converges more strongly. On a screen placed closer than both focal lengths, the violet component has already narrowed toward its nearer focus and occupies the inner region while red remains spread outside, giving circular coloured bands with violet innermost and red outermost. Hence (B).

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

⏱ 2mℹ️ Source: QB

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