Physics, asked by simranchamoli1234, 1 year ago

A lens of material of refractive index n2 is surrouded by a medium of refractive index n1 . The focal length 'f' is related as_____

Answers

Answered by rakeshmohata
5
Hope u like my process
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If a lens is surrounded by air,

It's focal length is calculated or is given by,

 =  > \it  \frac{1}{f}  = (n - 1)( \frac{1}{ r_{1} }  -  \frac{1}{ r_{2}} )
Where f = focal lenght;

=> n = refractive index of lens.

=> r1 and r2 are the radius of curvatures.

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If the lens has n2 and is surrounded by refractive index n1,

we can write focal length as,

 =  >  \bf \frac{1}{f}  = ( \frac{n _{2} }{  n_ {1} }  - 1)( \frac{1}{ r_{1} }  -  \frac{1}{ r_{2}} )
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Hope this is ur required answer

Proud to help you

rakeshmohata: thanks for the brainliest one
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