Question

The focal length of the objective of a compound microscope is

• A. greater than the focal length of eye piece
• B. lesser than the focal length of the eye piece
• C. equal to the focal length of the eye piece
• D. any of (a) (b) and (c)

Answer 1

The correct option is B lesser than the focal length of the eye piece

In a compound microscope the objective lens has very short focal length and it is placed closer to the object. While the eye piece has larger focal length. This combination magnifies the images and magnified images can be viewed through a compound microscope.
Hence the focal length of the objective lens is lesser than the focal length of the eye piece.