Questions
A simple microscope consists of a concave lens of power –10D and a convex lens of power +20D in contact. If the image is formed at infinity, then the magnifying power is (D = 25 cm)
a
2.5
b
3.5
c
2.0
d
3.0
detailed solution
Correct option is A
P = Power of combination =P1+P2=+20 + −10=+10D∴ F=1P=110m=10cm.For normal vision m=DF=2510=2.5Talk to our academic expert!
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