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  4. A lens is cut from the optical centre along the principal axis and the two parts of the lens are placed sideways as shown in figure. Then the new focal length of the combination:

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Q. A lens is cut from the optical centre along the principal axis and the two parts of the lens are placed sideways as shown in figure. Then the new focal length of the combination:Physics Question Image

Ray Optics and Optical Instruments

Solution:

Correct answer is (c) Becomes half