Question

An object of size 7cm is places at 27cm in front of a concave mirror bearing focal length is 18cm find the position nature and size of the image

Answer 1

Answer:

Position: beyond centre of curvature of mirror.

nature:real and inverted.

Size:enlarged

image will be formed 54 cm on the left of mirror.

Size:14cm below the principal axis.

Hope it will help you!

Answer 2

Answer:

Given: $h_{o}$= 7cm

u = -27cm

f = -18cm

v = ?

Mirror Formula:

= 1/v = 1/f - 1/u

= -1/18 + 1/27 = -3 + 2/54 = -1/54

So, v = 54cm

∴ The screen should be placed 54cm from the Mirror and the image is Real and Inverted.

Magnification (m) = $h_{i} /h_{o}$ = -v/u ⇒ $h_{i}$ = -54/27 x 7 = -14cm

∴ The image is Enlarged two times.