Question

object is placed at a distance of 4cm of convex mirror whose focal length 5cm where is the image formed​

Answer 1

Explanation:

When an object of height 1 cm is kept at a distance 4 cm from a concave mirror is attract image of height 1.5 cm is formed at a distance 1 centimetre behind mirror find the focal length of the mirror.

Answer 2

According sign convention ,

Object distance (u) = -4 cm

Focal length (f) = 5 cm

We know that , the mirror formula is given by

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

Thus ,

1/5 = 1/v + (-1/4)

1/5 = 1/v - 1/4

1/v = 1/5 + 1/4

1/v = (4 + 5)/20

v = 20/9

v = 2.2 cm

Therefore , image distance = 2.2 cm

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