Question

The magnifying power of a compound microscope can be increased by

• A. Using both lenses of longer focal length
• B. Taking objective lens of shorter focal length
• C. Using both lenses of smaller focal length
• D. Taking objective lens of longer focal length and eye-lens of shorter focal length

Answer 1

Answer: (C)

Using both lenses of smaller focal length

Correct answer is (c)

The magnifying power of a compound microscope is the ratio of the angle subtended at the eye by the image as seen through the lens to the angle subtended by the object at the unaided eye, when both are placed at the least distance of distinct vision, it is denoted by M.

So, by using the lenses of smaller focal length magnifying power of microscope can be increased.