Question

2 An object of height 2 cm is placed at a distance of 15
cm from a concave mirror of focal length 10 cm
Draw a scale diagram to locate the image. From the
diagram, find the length of the image formed.​

Answer 1

Explanation:

by mirror formula ,

1/ f = 1/v- 1/u .........(1)

f = -10 cm

v = ?

u = -15 cm

from (1), 1/ v = 1/f + 1/ u

1/ v = 1/-10 + 1/ -15

= -1 / 10 - 1/15

= -3 -2 / 30

v = - 6 cm