Question

An object is placed 6 cm away from a mirror of focal length 11 cm. Calculate the image distance.

Answer 1

We have given that

As here we have not given the type of mirror so i do it for both the mirrors

Case 1 when we have convex mirror the,

object distance (u) =- 6 cm

focal length (f) = + 11 cm

Image distance (v) = ?

Using mirror formula we have the relation as

1/v = 1/f - 1/u

1/v = 1/11 - 1/-6 = 17/66

Therefore , image distance v = 3.8823 cm

Case 2 when we have concave mirror then

Just focal length sign will be changes so that,

f = -11 cm

So that

1/v = 1/f - 1/u

1/v = 1/-11 -1/-6 = 5/66

Therefore image distance v = 13.2 cm