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What happens when a convex lens is dipped in water?what about concave lens ?what happens when a unit positive charge is thrown to a stationary unit positive charge?

What happens when a convex lens is dipped in water?what about concave lens ?what happens when a unit positive charge is thrown to a stationary unit positive charge?

Grade:12th pass

2 Answers

Arun
25750 Points
5 years ago
Dear student
 
if we dip a convex lens in water, its focal length increses. 
also for concave lens its focal length increases.
 
Regards
Arun (askIITians forum expert)
Khimraj
3007 Points
5 years ago
focal length
1/f = ((nl/ns) -1) (1/R1 - 1/R2)
nl = refractive index of lens
ns = refractive index of surrounding medium
So as ns increase 1/f decreaase
and focal length f increase.
Hope it clears.

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