Tue February 26, 2013 By: Vinny

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

Expert Reply
Tue February 26, 2013
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.
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