Question

A person wears glasses of power -1.75D.Is the person farsighted or nearsighted?What will be focal length of the lens

Answer 1

The focal length of the lens is (-57.1 cm) and the person is suffering from nearsightedness.

Explanation:

Given that,

Power of the lens used by the person, P = -1.75 D

The person is suffering from nearsightedness or myopia. The power is negative it is myopia and corrective lens is concave lens.

We need to find the focal length of a lens. We know that the reciprocal of the power is called focal length of the lens. It is given by the formula as:

$f=\dfrac{1}{P}\\\\f=\dfrac{1}{-1.75}\\\\f=-0.571\ m\\\\f=-57.1\ cm$

So, the focal length of the lens is (-57.1 cm). Hence, this is the required solution.

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Power of a lens

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