Question

What is the position of an object placed 15 cm away from a concave mirror of the radius of curvature 20cm?

Answer 1

your question is wrong

if the question is asked like this

what is position of image placed 15cm away from a concave mirror of radius of curvature 20 cm

your answer is

given,

object distance = -15 cm

radius of curvature = -20 cm

focal length = -10 cm

According to mirror formula

1/f = 1/v + 1/u

1/v = 1/f - 1/u

= -1/10 + 1/15

= -15+10/150

= -5/150

= -1/30

v = -30 cm

here negative sign indicates that image is real

image is formed 30 cm away from concave mirror

image is formed beyond C

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