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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 $L_{1} = \frac{P}{2}$

b

Power of $L_{2} = \frac{P}{2}$

c

Power of $L_{3} = \frac{P}{2}$

d

Power of $L_{1} = P$

answer is A.

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Detailed Solution

If a lens is cut into two half along principal axis, its focal length remain unchanged only the intensity of image get reduced.

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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.