Question

A convex lens has a focal length of 10cm. When it is immersed in water it will behave as?

Answer 1

as it is

.... convex .........

Answer 2

Hey Dear,

● Answer -

Convex lens will behave like focal length of 40 cm in water.

● Explaination -

# Given -

ng = 1.5

nw = 1.33

f = 10 cm

# Solution -

Focal length of convex lens in water is given by formula -

fw = fg.nw(ng-1) / (ng-nw)

fw = 10 × 1.33 (1.5-1) / (1.5-1.33)

fw = 40 cm

Hence, Focal length of convex lens in water is 40 cm.

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