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Solution


Q.

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          [2019]
1 0  
2 P2  
3 P4  
4 P  

Ans.

(4)

When an equiconvex lens is cut into two symmetrical halves along the principal axis, then there will be no change in focal length of the lens.

∴   Power of lens,  P=1f

So, the power of each part will be P.