A beam of light is incident parallel to principal axis on a convex lens (L) of focal length f = 20 cm. A
plane mirror PQ (See figure), inclined at 60° with the principal axis, is placed a distance ‘d’ behind the
lens so as to form a real image I of the distant object at a distance ‘d’ from the optical center of the lens as
shown in the figure. The value of ‘d’ is

The value of d is

A

5 $$\mathrm{cm}$$

B

10 $$\mathrm{cm}$$

C

15 $$\mathrm{cm}$$

D

20 $$\mathrm{cm}$$