Question

An object is placed at a distance of 15 cm
from a convex lens of focal length 10 cm.
On the other side of the lens, an convex
mirror is placed at its focus such that the
image formed by the combination coincides
with the object itself. The focal length of the
convex mirror is
Only one option is correct
A
20 cm
B
O
10 cm
C
O
15 cm
D
O
30 cm​

Answer 1

Answer:

i hope this is correct

Answer 2

Answer:

Ray Optics and Optical Instruments. An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed such that its distance, from the lens, equals the focal length of the lens. ... Therefore, focal length of the convex mirror is 100 cm