Question

The power of a lens is+250 what kind of lens is it and what is its focal length

Answer 1

it's focal length is 0.004 d

Answer 2

Answer:

The focal length is 0.4 cm and lens is convex lens.

Explanation:

Given that,

Power = +250 D

We need to calculate the focal length

Using formula of power

$P=\dfrac{100}{f}$

$f=\dfrac{100}{P}$

Where, f = focal length

P = power of lens

Put the value into the formula

$f=\dfrac{100}{250}$

$f=0.4\ cm$

Focal length is positive so the lens will be convex lens.

Hence, The focal length is 0.4 cm and lens is convex lens.