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A convex lens of power `2 D` and a concave lens of focal length `40cm`are kept in contact, find (a) Power of combination , (b) Equivalent focal length |
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Answer» Correct Answer - B::C (a) Applying `P=P_1+P_2=P_("convex")+P_("concave")` `=2+(1)/((-0.4)) , [P("in" D)=(1)/(f(in m))]` `=2-2.5=-0.5D` (b) `F=1/P` `=1/(-0.5)=-2m` `=-200cm` |
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