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QNEET-2022-Ph-450: NEET 2022 Physics - Class 12 NEET-2022-Ph-450 Solution: A biconvex lens has radii of curvature 20 cm each. If the…
A biconvex lens has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1.5 the power of the lens is +2 D +20 D +5 D Infinity
Multiple Choice Options
- A +2 D
- B +20 D
- C +5 D
- D Infinity
Step-by-Step Verified Solution
Power of lens is given by
P = 1 f ( m )
1 f = ( _ _ 1 ) ( 1 R 1 _ 1 R 2 )
1 f = { 3 2 _ 1 } ( 1 20 + 1 20 )
f = 20 cm
P = 1 20 _ 10 _ 2
= 5 D