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Q.

A convex lens has power P. It is cut into two halves along its principal axis. Further one piece(out of the two halves) is cut into two halves perpendicular to the principal axis(as shown in figure). Choose the incorrect option for the reported pieces

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a

Power of L1=P2

b

Power of L1=P

c

Power of L3=P2

d

Power of L2=P2

answer is A.

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Detailed Solution

If lens cut into two halves parallel to principal axis there is no change in power but when cut perpendicular  to principal axis power is halved.

Therefore, 

Power of L1=P 

and

Power of L2=L3=P2

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