Question

If power of a lens is -0.5 dioptre focal length and type of lens is

Answer 1

Answer: P = 1/f

- 0.5 = 1/f

f = -2 m

Explanation:

Since focal length of given lens is negative so it is a diverging lens.

Answer 2

The focal length of the lens is -200 cm.It is a concave lens.

Explanation:

The power of a lens is -0.5 D. It is required to find the focal length of the lens. The relation between the focal length and the power of a lens is given by :

$P=\dfrac{1}{f}\\\\f=\dfrac{1}{P}\\\\f=\dfrac{1}{(-0.5)}\\\\f=-2\ m\\\\f=-200\ cm$

So, the focal length of the lens is -200 cm. Since, it is negative, it must be a concave lens.

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