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Geometrical Optics

Section: Physics

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Question : 18 of 59

Marks: +1, -0

A wide slab consisting of two media of refractive indices

n_{1}

n_{2}

is placed in air as shown in the figure. A ray of light is incident from medium

n_{1}

n_{1}

\theta

\sin \theta

is slightly larger than

\frac{1}{n_{1}}

. Take refractive index of air as 1 . Which of the following statement(s) is(are) correct?

[JEE Adv 2021 P1]

The light ray enters air if $n_{2}=n_{1}$
The light ray is finally reflected back into the medium of refractive index $n_{1}$ if $n_{2} < n_{1}$
The light ray is finally reflected back into the medium of refractive index $n_{1}$ if $n_{2} > n_{1}$
The light ray is reflected back into the medium of refractive index $n_{1}$ if $n_{2}=1$

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