WB JEE 2026 | Geometrical Optics Question 6 | Physics

WB JEE 2026

MCQ (More than One Correct Answer)

-0.25

A ray of light travelling in air is incident on one face of a parallel glass slab of thickness $t$ and refractive index $\mu$ at an angle of incidence $i$ ．Total time spent by the ray inside the slab is

$\frac{\mu^2 t}{c \sqrt{1-\mu^2 \sin i}}$

$\frac{\mu t}{c \sqrt{\mu^2-\sin ^2 i}}$

$\frac{\mu^2 t}{c \sqrt{\mu^2-\sin ^2 i}}$

$\frac{t}{c \sqrt{\mu^2-\sin ^2 i}}$

WB JEE 2026

MCQ (More than One Correct Answer)

-0.5

An electromagnetic wave，whose wave normal makes an angle of $45^{\circ}$ with the vertical，is travelling in air and strikes a horizontal liquid surface．While travelling through the liquid，it gets deviated by $15^{\circ}$ ．If the speed of electromagnetic wave in air is $3 \times 10^8 \mathrm{~m} / \mathrm{s}$ ，then the speed of electromagnetic wave in the liquid will be

$\frac{\sqrt{2}}{3} \times 10^8 \mathrm{~m} / \mathrm{s}$

$1.5 \times 10^8 \mathrm{~m} / \mathrm{s}$

$2.1 \times 10^8 \mathrm{~m} / \mathrm{s}$

$2.5 \times 10^8 \mathrm{~m} / \mathrm{s}$

WB JEE 2018

MCQ (More than One Correct Answer)

-0

WB JEE 2018 Physics - Geometrical Optics Question 16 English

A ray of light is incident on a right angled isosceles prism parallel to its base as shown in the figure. Refractive index of the material of the prism is $$\sqrt 2 $$. Then, which of the following statement(s) is/are true?

The reflection at P is total internal.

The reflection at Q is total internal.

The ray emerging at R is parallel to the ray incident at S.

Total deviation of the ray is 150$$^\circ$$.

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