Question
Mon February 25, 2013 By:

Solve the following question:

Expert Reply
Tue February 26, 2013
P=4=1/f  in m
f=1/4  m=0.25 m
If the lens is immersed in water completely, then its f will be 4 times....from lens maker's formula putting the value of refractive index of two materials it can be easily found.
 
f in water=1m
P in water will be=+1D
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