A ray of light is incident on a glass slab of thickness t, at an angle i, r is the angle of refraction in the glass slab. Distance travelled in the glass slab is

Question

A ray of light is incident on a glass slab of thickness t, at an angle i, r is the angle of refraction in the glass slab. Distance travelled in the glass slab is (A)  t cos r  (B)  t tan r  (C) ( t/ cos r)  (D) ( t/ sin r)

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/b3bdacbe463adfd24ddc8e1d1e5ea82b-.png" /> As clear from figure, Distance travelled in glass slab =OB=(O C/ cos r) ⇒ OB=(t/ cos r)

Q. A ray of light is incident on a glass slab of thickness $t$ , at an angle $i, r$ is the angle of refraction in the glass slab. Distance travelled in the glass slab is

$t cos r$

$t tan r$

$\frac{t}{c o s r}$

$\frac{t}{s i n r}$

As clear from figure,
Distance travelled in glass slab
$= OB = \frac{OC}{c o s r}$
$\Rightarrow OB = \frac{t}{c o s r}$

Q. A ray of light is incident on a glass slab of thickness t, at an angle i,r is the angle of refraction in the glass slab. Distance travelled in the glass slab is

tcosr

ttanr

cosrt​

sinrt​