WAEC - Physics (2000 - No. 25)

In the diagram above, an incident ray AY makes an angle of 30o with the normal XY. If the mirror is rotated anticlockwise about Y through an angle of 20o, while AY is fixed, what angle will the reflected ray now make with the incident ray?

70^o

80^o

100^o

120^o

Explanation

The reflected ray will rotate through angle 2 x 20º = 40º

The reflected ray will now make angle 30º + 30º + 40º = 100º with the incident ray(30º + 30º since i = r)

WAEC - Physics (2000 - No. 25)

Explanation

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