Power of a convex lens of focal length 50 cm isA- -2 DB- -0-5 DC- -0-5 DD- -2 D

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Standard IX

Physics

Power of a Lens

Power of a co...

Question

Power of a convex lens of focal length 50 cm is ___.

-2D

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-0.5D

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+2D

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+0.5D

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Solution

The correct option is C +2D
Let $P$ be the power of the lens and $f$ be its focal length.
Given, $f = 50 c m$
$P = \frac{100}{f (c m)} = \frac{100}{50} = 2 D$

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Power of a convex lens of focal length 50 cm is ___.

The correct option is C +2DLet P be the power of the lens and f be its focal length. Given, f=50 cm P=100f(cm)=10050=2D

The correct option is C +2D
Let $P$ be the power of the lens and $f$ be its focal length.
Given, $f = 50 c m$
$P = \frac{100}{f (c m)} = \frac{100}{50} = 2 D$