Question

At what distance should an object be placed in front of a concave mirror of focal length 50cm so that an
image of triple of its size is obtained?
​

Answer 1

Answer:

75 cm

Explanation:

Given,

Focal length, f=50cm

Magnification, m=2

m=

u

v

=2

v=2u

From mirror formula,

f

1

=

v

1

+

u

1

f

1

=

2u

1

+

u1

u= 23f= 2

3×50 =75 cm

Object Is placed at 75cm from the mirror