A bi convex lens of focal length 10 cm is cut in two identical parts along a plane perpendicular to the principal axis. The power of each lens after cut is ________ D. [2023]

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Solution

Q.
A bi convex lens of focal length 10 cm is cut in two identical parts along a plane perpendicular to the principal axis. The power of each lens after cut is ________ D. [2023]

Ans.
(5)

$Let power of each part is P_{1}, then$

$P_{1} + P_{1} = P = \frac{1}{f}$

$2 P_{1} = \frac{1}{0.1} = 10$

$P_{1} = 5 D$

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