Question

The focal length of a concave mirror is 30 cm. If a point of object is placed at a distance 40 cm from
a concave mirror then the distance of image from the mirror is​

Answer 1

Explanation:

u = -40

f= -30

1/v +1/u = 1/f

1/v = -1/30 - (-1/40)

1/v = -1/30+1/40

1/v = -4+3/120

1/v = -1/120

V= -120cm

image is 120 cm from mirror

Answer 2

Answer:

hope it will help u understand