The equiconvex lens has focal length f. If is cut perpendicular to the principal axis passin through optical centre, then focal length of each half is

Options

A. `(t)/(2)`
B. t
C. `(3t)/(2)`
D. `2t`

Answer

D

Explanation

When an equiconvex lens is cut parallel to principle axis focal length remains the same and when the lens is cut perpendicular to principle axis its focal length becomes twice the original .