Question

A concave mirror of radius of 30cm produces and image three times in size of the object the distance of the object from the mirror is?​

Answer 1

$\\ \sf\longmapsto m=\dfrac{-v}{u}$

• v is image distance and u is object distance.

$\\ \sf\longmapsto 3=\dfrac{-v}{30}$

$\\ \sf\longmapsto -v=30(3)$

$\\ \sf\longmapsto v=-90cm$

Answer 2

Answer:

Given that,

The radius of curvature, R = 15 cm

The radius of the mirror, f = -7.5 cm

We need to find the object's distance from the mirror. The mirror's formula is used to find the object distance such that,

So, the object distance is 6 cm

Explanation: