MHT CET 2023 Physics question

A double convex lens of focal length 'F' is cut into two equal parts along the vertical axis. The focal length of each part will be

(A)2 FCorrect
(B)F
(C)
(D)4 F

Answer: (A)

Solution

For a double convex lens of equal radii : . Cutting it into two equal halves by a plane through the optical centre perpendicular to the principal axis gives two identical plano-convex lenses, each with one curved face of radius and

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Question ID VK-096329