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Grade: 12th pass
        What happens to focal length of concave lens if it is placed in water?
10 months ago

Answers : (1)

Shubham Kumar Gupta Ggps
42 Points
							According to theSnell`s LawsinQ1/sinQ2=V1/V2in figure Q1,Q2,V1 and V2 are angles and velocity of light respectively.Lens in airthe refractive index is1.5In your case:lens  is immersed in water.straight light ray pass from glassto water at  the right side of lens the refractive index for water andglass system isvelocity of light in water/velocity of light in glass2.255*10^8/2*10^8=1.1275more the refractive index more the light beam bend away  from normal while travelling from highdensity medium to low density medium and hence focal length is less.refractive index for lens immersed in water is less than that of lens in air, so according tothe refractive index value focal length will shift.in case 2 focal length is more than case 1.
						
10 months ago
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