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Question

A thin biconvex lens is made with a material having refractive index μ=1.5. It is dipped in water (μ=1.33). It will behave like

A
A converging lens
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B
A diverging lens
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C
A rectangular slab
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D
A prism
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Solution

The correct option is A A converging lens
Given:
Refractive index of medium, μ1=1.33
Refractive index of lens, μ2=1.5

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=(1.51.31)(1R+1R)
f>0
Since f is positive, parallel rays will form image to the right of the lens. Hence, it will behave as a convergent lens.

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