a lens with focal length 'f' in air, is immersed into water. what is its new focal length?
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The index of refraction of water (about 1.33) is closer to the index of the glass (typically 1.5 to about 1.6) than is the index of refraction of air (refractive index 1.0) compared to glass. The closer index of refraction results in a smaller deflection of a ray of light passing through the surface of the lens when the lens is in water. This reduced deflection weakens the effect of the lens, meaning the lens exhibits a longer focal length.
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Answer:
Explanation:
The distance between optical centre and principal
focus is called focal length of a lens
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