1.

A biconvex lens made of glass of refractive index 1.5 has radius of currature of both of itssurfaces as 40cm. Calculate the (i) power and (ii) focal length of the lens. Also find out the changein the focal length of the lens when it is submerged in water. (The refractive index of water withrespect to air, 1.33 wan  ) ​

Answer»

ANSWER:

REFRACTIVE INDEX of glass=1.5

f=20cm

Power=1/0.20=5D

Focal length=20 CM



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