Question

An object at a large distance in front of a concave mirror of radius of curvature 40cm .The image will be formed in front of the mirror at a distance of?

Answer 1

Your answer

The image will be formed in front of the mirror at a distance of 20 cm.

Explanation

Given ,

• a concave mirror , in front of which an object is placed.

• The radius of curvature of the given concave mirror is ( R ) = 40 cm

We , can easily calculate the distance of image from the mirror by using the formula ,

• F = R / 2

( As the image will form at focii / focus )

So ,

• F = 40 / 2

• F = 20 cm

$\rule{200}{4}$

Key point →

Also remember ,

Mirror formula ,

$\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$

• This formula holds both tha concave and convex mirror formulae.

• By using this formula we can calculate the length of the object from mirror , focus , and the length of the image from mirror.