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The power of a convex lens is 2.5 dioptr...

The power of a convex lens is 2.5 dioptres. Find the focal length.

Text Solution

Verified by Experts

` P = 1/f therefore 2.5 D = 1/f`
` therefore f = 1/( 2.5 D ) = 0.4 m = 40 cm `
The focal length of the lens = 40 cm
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