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

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Standard X

Physics

Myopia and Its Correction

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
$P = \frac{1}{f}$
where P is the power of the lens
f is the focal length in centimeters
$P = \frac{100}{f} = \frac{100}{50} = 2 D$

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Power of a convex lens of focal length 50 cm is:

The correct option is C +2DP=1f where P is the power of the lens f is the focal length in centimeters P=100f=10050=2D

The correct option is C +2D
$P = \frac{1}{f}$
where P is the power of the lens
f is the focal length in centimeters
$P = \frac{100}{f} = \frac{100}{50} = 2 D$