Question

Find the position, nature and size of the image of an object 3 cm high place at a distance of 9 cm from a concave mirror of focal length 18 cm.

Answer 1

Given, height of object = + 3 cm object distance(v) = 9 cm focal length of concave mirror(f) = 18 cm Using Mirror formula, \(\frac{1}{v}+\frac{1}{v}=\frac{1}{f}\) For concave mirror, f = -18 cm, u = 9 cm

\(\implies\)v = 18 cm

Using Magnification equation,

\(\implies\)h_i = -6 cm

Thus, the image will be real, inverted and larger than the object.