First slide

The lens

Question

A glass lens is placed in a medium in which it is found to behave like a glass plate. Refractive index of the medium will be

Moderate

A

Greater than the refractive index of glass
B

Smaller than the refractive index of glass
C

Equal to refractive index of glass
D

No case will be possible from above

Solution

$\frac{f_{l}}{f_{a}} = \frac{(a_{g} - 1)}{(μ_{g} - 1)} \Rightarrow f_{l} = \infty {if}_{l} μ_{g} = 1 \Rightarrow_{a} μ_{l} =_{a} μ_{g}$

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