The power of an achromatic convergent lens of two lenses is + 2D. The power of convex lens is + 5D. The ratio of dispersive power of convex and concave lens will be
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a
5 : 3
b
3 : 5
c
2 : 5
d
5 : 2
answer is B.
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Detailed Solution
P1+P2=2D and P1=5D, so P2=−3D For achromatic combination ω1ω2=−p2p1=−−35=35
The power of an achromatic convergent lens of two lenses is + 2D. The power of convex lens is + 5D. The ratio of dispersive power of convex and concave lens will be