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Combinations of Lenses & Mirrors

Calculate the...

Question

Calculate the focal length of a convex lens of power 2D.

A

30 cm

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B

40 cm

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C

50 cm

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D

60 cm

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Solution

The correct option is C 50 cm
Given $p = \frac{1}{f}, ⟹ f = \frac{1}{p}$
$p = 2 D ∴ f = \frac{1}{2} m = 50 c m$

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