Two thin lenses of power +6 d and 2 d are in contact. What is the focal length of the combination?
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Answered by
2
Total power of combined lense=6d+2d =8d
since P=1/f(in cm)
8d=100/f
f=100/8cm
f=12.5cm
Answered by
1
Given power of 1st lens P₁ = 6 D
power of 2nd lens P₂ = 2 D
The combination power of the lenses P = P₁+P₂ = 6+(2)
P = 8 D
Also we know Power P = {1/focal length(f)}
f = 1/P = 1/8 =0.125 m
f = 12.5 cm
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