Question

An image is about 3times the size of the object what is the size of the object

Answer 1

Answer:

It is given that,

Magnification

m=3

m=

u

−v

f=

2

R

=−18cm

It is given that a virtual image three times the size of the object is obtained with a concave mirror. So, v=−3u

From mirror’s formula

v

1

+

u

1

=

f

1

3u

−1

+

u

1

=

−18

1

u=−12cm

The distance of the object from the mirror u=12cm in front of concave mirror.