Question

beam of light passes from medium 1 to medium 2 to medium 3 as shown in Fig. 1.344. What may be concluded about the three indices of refraction, and ?
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Answer 1

Answer:

Light bends towards normal in denser medium. Light bends further away from normal in rarer medium.

So from figure medium 2 is most dense. In medium 3 light bends further away from normal than initial angle from normal in medium 1. hence medium 3 is rarer than medium 1.

Denser the medium, higher the refractive index

So n

2

>n

1

>n

3

Answer. D) n

2

>n

1

>n

3

Answer 2

The following is the conclusion about the three indices

$\boxed{n_2>n_1>n_3}$

Explanation:

The figure is attached.

We know that when a ray of light travels from one medium to another, it either bends toward or bends away from the normal

If the ray is travelling from rarer medium to denser medium, it bends towards the normal and vice versa

In the figure

Since, in medium $n_2$ the ray of light is bending towards the normal

Therefore,  $n_2$ is the denser medium than  $n_1$

Thus,

$n_2>n_1$

Similarly when light travels from  $n_2$ to  $n_3$ it bends away from the normal

Hence,

$n_2>n_3$

If we take  $n_1$ and  $n_3$ medium we find that in  

Therefore,  $n_3$ is the rarest of all the mediums

Thus,

$n_2>n_1>n_3$

Hope this answer is helpful.

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