if a convex lense of focal length 10 cm and a concave lense of focal length 50 cm kept in contact with each other what will be the focal length of the combination
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+20 cm is the answer
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Two lenses of power 10 D and −10 D are in contact, find power, focal length and nature of lens combination.
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Given : P1=10 D and P2=−10 D
Power of combination of lenses Pnet=P1+P2
∴ Pnet=10−10=0 D
Focal length of combination of lenses Fnet=Pnet1=01=∞
Since focal length of plane lens is infinite. So above combination of lens becomes a plane lens.
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