Question

P
1. A combination of concave and convex lens in contact is placed over a plane mirror. When a
pin P is placed as shown in the figure, the image is formed at the position of the pin itself.
The focal length of the convex lens is 10 cm. Then the focal length of the concave lens is:
a) 40 cm
40
b)
3
c) 20 cm
20
d)
3
cm
40 cm
Cm​

Answer 1

Answer:

c) 20 cm is the correct answer to this question