A thin lens has a focal length of -50cm. what is the power of the lens and its nature?

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Solution

Short Answer

Since the focal length is negative, so the lens is concave.

Focal length, f = -50 cm = -0.50 m

∴ Power, P = 1f(in m) = 1-0.50 m = -2 D

What is the power of lens of focal length 50 cm? The power of the lens is always given as the reciprocal of focal length. For the focal length of 50 cm, the power is given as

Power = 1/focal length = 1/(50 x 10-2)m

= 100/50 = 2 dioptre.

The SI unit of power is dioptre.

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Since the focal length is negative, so the lens is concave.

Focal length, f = -50 cm = -0.50 m

∴ Power, P = 1f(in m) = 1-0.50 m = -2 D

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