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Question

A biconvex lens is made of a material having refractive index 1.2 is dipped into water having refractive index 1.33 will behave like a .

A
convergent lens
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B
diverging lens
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C
prism
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Solution

The correct option is B diverging lens
Given:
Refractive index of medium, μ1=1.33
Refractive index of lens, μ2=1.2

Let radius of curvature of the first surface be R.
Then, the radius of curvature of the second surface will be R.

Using Lens Maker's Formula;
1f=(μ2μ11)(1R11R2)
1f=(1.21.331)(1R+1R)
f<0
Since f is negative, parallel rays will form image to the left of the lens. Hence, it will behave as a diverging lens.

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