A magnifying glass is a combination of a convex lens of focal length 5cm and a concave lens of power -5D. If the distance of distinct vision is 20cm calculate the power of the magnifying glass.
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Given, D=25cm ;P
net
=16; f
net
=
P
ev
100
=
16
100
=
4
25
Magnification, M=1+
f
net
D
M=1+
4
25
25
=5
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