QQuestion
When a ray of light is incident normally on the surface of a glass slab, the angle of refraction will be:
(a) 0°
(b) 90°
(c) 180°
(d) 30°
✓Answer
(a) 0°
Explanation
When a ray of light is incident normally on the surface of a glass slab, the angle of incidence is 0°.
According to Snell’s law, the ray passes undeviated along the normal. Therefore, the angle of refraction is also 0°.
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