Question

13. A concave mirror of focal length 10 cm is placed at a distance of 35cm from a wall. How far from the wall an object be placed so that so that its image formed by the mirror falls on the wall?​

Answer 1

Answer:

An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.

a) Draw ray diagram for the formation of image

b) Calculate the image distance

c) state 2 characteristics of the image formed.

Given:

Focal length of concave mirror, f = -20 cm

Distance of object from the mirror, u = -10 cm

use formula, 1/v + 1/u = 1/f

or, 1/v = 1/f - 1/u

or, 1/v = 1/-20 - 1/-10

or, 1/v = -1/20 + 1/10 = 1/20

or, v = +20cm

hence, image position is the 20cm right side from the pole of the concave mirror as shown in the diagram. The image is straight and bigger than the object.