Question

find the position of an object held in front concave lens of focal length 12cm so as to form a real image and 4 times magnified. ​

Answer 1

Answer:

ANSWER

v

1

−

u

1

=

12

1

uv

u−v

=

12

1

-(1)

m=

u

−v

=3

v=−3u

using equation (1)

−u×3u

u+3u

=

12

1

u=−16cm

∴v = 48 cm

So u−v= 64 cm

Answer 2

Answer:

solution is in this pic

hope this helps you