Question

If an object is 14 cm in front of the convex mirror and image distance is 7 cm then it's focal length is

Answer 1

Explanation: Given that,

Object distance from the convex mirror, u = -14 cm (it is considered as negative)

Image distance from the mirror, v = -7 cm (negative as image is formed in the direction of object)

substitute in the following formula:

Mirror formula:

1/v + 1/u = 1/f

Lens formula:

1/v - 1/u = 1/f