Question

A concave mirror produces 2 times larger image of an object placed at 15cm in front of it. Calculate radius of the curvature

Answer 1

Answer: m=2

-v/u =m

V=2*-15

V=30

By mirror formula

1/f=1/v+1/u

1/f=1/-30 -1/15

1/f=-1-2/30

1/f=-3/30

1/f=-1/10

F=-10

Explanation:

Answer 2

Answer:

-20cm

Explanation:

m=-v/u=2 given

u=15cm

-v/-15=2

v=30cm

1/f=1/v+1/u

1/f=-1/30-1/15

1/f=-3/30

f=-10

Now the radius of curvature is twice of focal length R=2f

R=2(-10)=-20cm