Multiple choice

The focal length of the objective of a microscope is

  1. greater than the focal length of eye piece

  2. less than the focal length of eye piece

  3. equal to the focal length of eye piece

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a compound microscope, the objective lens has a very short focal length to produce a highly magnified real image of the specimen. The eyepiece has a relatively larger focal length to further magnify this image as a virtual image for the observer. Therefore, the focal length of the objective is less than that of the eyepiece.