A thin glass (refractive index 1 . 5 ) lens has an optical power of - 5 D in the air. Its optical power in a liquid medium with refractive index 1 . 6 will be

Question

A thin glass (refractive index 1 . 5 ) lens has an optical power of - 5 D in the air. Its optical power in a liquid medium with refractive index 1 . 6 will be, 1 D, -1 D, 25 D, -25 D

MARKS App · Accepted Answer

1 f a = ( μ - 1 ) ( 1 R 1 - 1 R 2 ) = 1.5 - 1 1 R 1 - 1 R 2 … … … … . . i a n d 1 f m = μ g - μ m μ m ( 1 R 1 - 1 R 2 ) 1 f m = 1.5 1.6 - 1 1 R 1 - 1 R 2 … … … . . i i Thus, f m f a = 1.5 - 1 1.5 1.6 - 1 = - 8 f m = - 8 × f ₐ = - 8 × - 1 5 ∵ f a = 1 p = - 1 5 m = 1.6 m ∴ P m = μ f m = 1 .6 1 .6 = 1 D

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