The separation L between the objective (f=0.5cm) and the eyepiece (f=5cm) of a compound microscope is 7cm.
Where should a small object be placed so that the eye is least strained to see the image?
A
0.5
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B
32
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C
5
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D
23
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Solution
The correct option is D23 When the eye is least strained, the eyelens is completely relaxed and it focuses parallel rays from infinity.
Therefore in this situation, the image formed by the eye piece has to be at infinity. For that, the image formed by the objective has to lie at the focal length of the eye piec (i.e 5cm to the left of the eye-piece).