Question

A ray of light passes from glass into air. The angle of refraction will be
(a) equal to the angle of incidence
(b) greater than the angle of incidence
(c) smaller than the angle of incidence
(d) 45°

Answer 1

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Greater than the angle of incidence

Answer 2

A ray of light passes from glass into air. The angle of refraction will be greater than the angle of incidence.

Explanation:

• When a ray of light travels from glass (a denser medium) to air (a rarer medium), then the angle of refraction will be greater than the angle of incidence.
• From the Snell’s law, we get that the ratio of the sines of the angles of incidence and refraction is constant.  
• So, from the Snell’s law, we found that when a ray of light travels from a denser medium to a rarer medium, it bends away from the normal.

Therefore the correct answer is Option (b) greater than the angle of incidence.