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Rectilinear Propagation of Light

Which of the ...

Question

Which of the following does not use a lens?

A

Spectacle

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B

Human Eye

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C

CD player

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D

Periscope

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Solution

The correct option is D Periscope
A periscope uses two plane mirrors.
Working of the human eye, spectacle and CD player is based on refraction by a lens.

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