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QAIPM-2000-Ph-3009: NEET 2000 Physics - Class 12 AIPM-2000-Ph-3009 Solution: For a plano convex lens (\( =1.5\)) has radius of curvature 10…
For a plano convex lens () has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering
Multiple Choice Options
- A 10 cm
- B 20 cm
- C 15 cm
- D 25 cm
Step-by-Step Verified Solution
1 f = ( _ _ 1 ) ( 1 R 1 _ 1 R 2 )
= ( 1.5 _ 1 ) ( 1 � _ 1 _ 10 ) = 0.5 ( 1 10 )
_ f = 20 cm
When plane surface is silvered, F = f 2 = 20 2 = 10 cm