A real image is formed by a convex lens. If we put a concave lens in contact with it, the combination again forms a real image. The new image

Options

A. is closer to the lens system
B. is farther from the lens system
C. is at the original position
D. may be anywhere depending on the focal length of the concave lens

Answer

B

Explanation

When concave lens is put in contact with convex lens, real image is formed i.e., equivalent lens is convex. The focal length of equivalent lens F is greater than focal length of convex lens.
`(1)/(v)-(1)/(-u)=(1)/(f)implies(1)/(v)=(1)/(f)-(1)/(u)=(u-f)/(uf)`
`v=(uf)/(u-f)impliesv=(u)/((u)/(f)-1)`
As `f` increases `(u)/(f)` decreases `((u)/(f)-1)` decreases `v` increases.