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CBSE - X - Physics - Light - Reflection and Refraction

a concave mirror and a convex lens are held in water. what changes are expected in their focal lengths? explain

Asked by vinny 26th February 2013, 12:46 PM
Answered by Expert


There will not be any change in the focal length of the concave mirror.As the light ray comes from water and gets reflected in the same medium, there will not be any change in the focus point.
Where as the focal length of convex lens will become 4 times.As light ray will nowbend from glass to water....the degree of bending will be less than when light was bending from glass to air.
Answered by Expert 26th February 2013, 1:18 PM

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