Question

A simple microscope is used to see the object first in blue light and then in red light. Due to the change from blue to red light, what is the effect on its magnifying power?

Options

• Magnifying power increases

• Magnifying power decreases

• Magnifying power is independent of colour of light

• Magnifying power remains constant

Answer 1

Magnifying power decreases

Explanation:

The magnifying power of the simple microscope is given by

M.P. = `1+"D"/"f"`

The focal length of red light is greater than that of blue light. Hence the magnifying power decreases.