Question

a concave mirror form an irrect image of an object placed at a distance of 10cm from it the size of image is double that of the object. where is the image formed​

Answer 1

Explanation:

Given that a concave mirror form an irrect image of an object placed at a distance of 10cm from it the size of image is double that of the object.

Magnification formula for mirror:

m = -v/u

As per given condition,

image distance = 2 × object distance

→ v = 2u

Substitute the values,

m = -(2u)/(-u)

m = 2u

Object is palced at a distance of 10 cm (u = 10 cm).

m = 2(10)

m = 20 cm

Hence, the image is formed at a distance of 20 cm.