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An equiconvex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be

1. P
2. 0
3. P/2
4. P/4

Correct answer: P/2

Solution

When an equiconvex lens is cut symmetrically along a plane containing the principal axis, the focal length of each half remains the same as the original lens. However, the aperture is halved, so the power of each half becomes half of the original power, i.e., P/2.

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