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Question

# Two transparent media of refractive indices μ1 and μ3 have a solid lens shaped transparent media of refractive index μ2 between them as shown in figure. The correct relation between refractive indices is:

A
μ1>μ2>μ3
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B
μ3>μ2>μ1
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C
μ2>μ3>μ1
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D
μ3>μ2=μ1
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Solution

## The correct option is B μ3>μ2>μ1When incident ray is striking the spherical surface of lens, it is getting refracted away from normal. That means incident ray is going from denser to rarer medium. ∴ μ3>μ2 Again, at the plane surface of the lens, the refracted ray is bent away from the normal (N′) to the surface. ∴ μ2>μ1 Thus, μ3>μ2>μ1 Why this question? Bottom line: Instead of visualizing the lens as a complex system, let us apply the laws of refraction at both the surfaces (spherical and plane) of lens. Tip: Light ray will bend towards normal if it travelling from a rarer to denser medium.

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