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Q. A biconcave lens of power P vertically splits into two identical plano concave parts. The power of each part will be (a) 2P (b) P/2 (c) P(d) P/√2 |
| Answer» F lens = PPower of each part On mutual terms ,Power is inversely propotional to the focal length.Also, Power = Now, Focal length and THICKNESS have a relation.And the relation turns out be FOCAL LENGTH is INVERSELY propotional to THICKNESS i.e. f = Now, When the lens splits up into two equal parts - The focal length is actually DOUBLED (2F)And as mentioned above , the power will become half of what it was earlier.SO THE ANSWER TURNS OUT BE - Option (b) | |