A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is

Options

A. (a)virtual and at a distance of 16 cm from the mirror
B. (b)real and at a distance of 16 cm from the mirror
C. (c)virtual and at a distance of 20 cm from the mirror
D. (d)real and at a distance of 20 cm from the mirror

Answer

B

Explanation

`(1)/(v) + (1)/(30) = (1)/(15) imples (1)/(v) = (1)/(30) "and" (1)/(v) - (1)/(10) = (1)/(15)`
`implies (1)/(v) = (1)/(15) + (1)/(10) implies v = 6`