An object is seen first in red light and then in violet, yellow and green lights successively through a simple microscope. For which colour the magnifying power of the simple microscope will be maximum ?

Options

A. Green
B. Red
C. Yellow
D. Violet

Answer

D

Explanation

For a lens `(1)/(f) =(n-1)k " where " k=((1)/(R_(1))-(1)/(R_(2)))`
`therefore f prop (1)/((n-1)) " as " n_(v) gt n_(R ) therefore f_(V) lt f_(G) lt f_(Y) lt f_(R )`
and Magnifying Power `=1+(D)/(f) or (D)/(f)`
`therefore M.P. prop (1)/(f)`
`therefore ` As `f_(V)` is minimum, M.P. for violet colour will be maximum.