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Question : 3
Total: 4
With the help of a ray diagram, show how a compound microscope forms a magnified image of a tiny object, at least distance of distinct vision. Hence derive an expression for the magnification produced by it. 3
Solution:
Image formation by compound microscope at the least distance of distinct vision:
Expression for magnification:
For objective,
Magnification= m o =
=
When the image is formed at the least distance of distinct vision, then
Magnification= m e = 1 +
So, final magnification= m = m e =
( 1 +
)
Expression for magnification:
For objective,
Magnification
When the image is formed at the least distance of distinct vision, then
Magnification
So, final magnification
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