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Telescope

A plano-conve...

Question

A plano-convex lens of f=20 cm is silvered at plane surface, now , its focal length is $(μ = 1.5)$

A

20 c m

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B

40 c m

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C

30 c m

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D

10 c m

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Solution

The correct option is D $10 c m$
Option D is correct

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