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Question

A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquid L1 or L2 having refractive indices μ1 and μ2 respectively (μ2>μ1>1). The lens will diverge a parallel beam of light if it is filled

A
L1 and immersed in L2
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B
L2 and immersed in water
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C
Water and immersed in L2
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D
Air and immersed in either water or L1 or L2
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Solution

The correct options are
A L1 and immersed in L2
B Water and immersed in L2
D Air and immersed in either water or L1 or L2
A convex lens is a converging lens by nature but only if it is placed in a medium that has a refractive index lower than that of the material of the lens.
If placed in a medium of higher refractive index, all the lenses have a tendency to invert their behaviour.
Thus, all points must point to the immersion of the lens in a medium of a refractive index higher than that of the metal

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