Question

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct? [NCERT Exemplar Problems]
(a) A
(b) B
(c) C
(d) D

Answer 1

Answer:

Answer is B.

Explanation :

When light travels from one medium to another, it generally bends, or refracts. The law of refraction gives us a way of predicting the amount of bend. The law of refraction is also known as Snell's law, named for Willobrord Snell, who discovered the law in 1621.

Snell's law gives the relationship between angles of incidence and refraction for a wave impinging on an interface between two media with different index of refraction.

Thus, when a ray of light passes through the rectangular slab, the angle of incidence is equal to angle of emergence and this implies that, the incident ray and the emergent ray are parallel to each other.

Hence, option B is correct.

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Answer 2

(b)$\huge\bf\pink{B}$

$\large\bf\red{Explanation✓}$

Light bends towards normal when it passes from air to glass. Light bends away from normal when it passes from glass to air. This is appropriately shown in figure b).