Question

A concave mirror produces a real image of size 3 times that of the object at a distance of 30cm
from pole of the mirror. Find position of the object

Answer 1

Answer:

90cm

Explanation:

Given:

Object distance =u=-30cm(by sign convention)

v=?

height of object be =h cm

height of image=- 3h cm(real image)h=-v/u

m=height of image/height of object

⇒-3h/h = -v/u

h3=v/u

⇒v=uX3

∵u=-30cm

we get v=-30x3

⇒-90cm

Negative sign indicates that image formed is real and inverted at a distance of 90cm from mirror.