Question

The magnification of a microscope is increased when_________.

A. The focal length of the objective lens is increased.
B. The focal length of the objective lens is decreased.
C. The focal length of the eyepiece is increased.
D. The distance between the objective lens and eyepiece is decreased.

Answer 1

b

Step-by-step explanation:

Answer 2

Option B

Step-by-step explanation:

Magnification of Microscope is

`M = M_o * M_e`

Mo= Magnification of objective lens and

Me= magnification of the eyepiece.

Both magnifications( of objective and eyepiece) are inversely proportional to the focal length.

Magnification,

`M \propto (1)/(f)`

when the focal length is less magnification will be high and when the magnification is the low focal length of the microscope will be more.

Thus. Magnification will increase by decreasing the focal length.

The correct answer is Option B