what is the effect on focal length when concave lens is put in water
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no change in the focal length
Shweta942001:
Focal length increase
c focal length is equal to half of curvature
in case of mirror there is no effect
sorry I am a student of class 10 so I don't know the correct answer
Ok
question is of 12th
sorry but being student of class 10 I have a little bit knowledge of this
it's ok
thnx
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Lenses depends on a specific property of refraction, which depends on the ratio of refractive indexes of the two media on either side of an interface.
Coming to Focal length of the lens ; the Focal length is inversely proportional to the Refractive index(bending of light) in the medium;
The refractive index ratio of glass(lens) to air is greater than the the refractive index ratio of glass(lens) to water i.e 1.33/1(=1.33) >1.33/1.44 (=0.9236)
So,the focal length increases when it is dipped inside water
Coming to Focal length of the lens ; the Focal length is inversely proportional to the Refractive index(bending of light) in the medium;
The refractive index ratio of glass(lens) to air is greater than the the refractive index ratio of glass(lens) to water i.e 1.33/1(=1.33) >1.33/1.44 (=0.9236)
So,the focal length increases when it is dipped inside water
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