Question

The image shows the path of light travelling through a glass slab. What causes the ray of light to deviate from its original path?

A) change in amount of light
B) change in direction of the wind flow
C) change in temperature of the air
D) change in density of the medium.

Answer 1

d change in denaity of the medium the light refacts

Answer 2

The correct option is D) change in the density of the medium

• The figure here depicts the phenomenon of the refraction of light.
• Refraction of light refers to the phenomenon of light being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
• When light travels from one medium to another medium, its velocity changes, thus it moves either towards the normal or away from it.
• When the light travels from a rarer medium to a denser one, its velocity decreases thus it bends towards the normal.
• When the light travels from a denser medium to a rarer one, its velocity increases thus it bends away from the normal.
• In this figure, the light in the first refraction is traveling from air (a rarer medium) to the thick glass slab (a denser medium) thus it is bending towards the normal. After the second refraction, it is moving away from the normal as it is moving from denser to a rarer medium in that scenario.

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