Question

Concave mirror forms real image of object magnified 2 times. distance between object and image is 20cm. find radius of curvature.

Answer 1

Answer:

M= -2

v-u =20 cm

For mirror

m= -v/u

-2= -v/u

v=2u

20+u=2u

u=20 cm

1/f=1/v+1//u

1/f=1/2u+1/u

1/f=3/2u

1/f=3/40

f=40/3

r=80/3

r=26.6 cm