An incident ray is reflected normally by a plane mirror onto a screen where it forms a bright spot. The mirror and screen are parallel and 1m apart. If the mirror is rotated through 5o, calculate the displacement of the spot
-
A.
8.7cm -
B.
10.0cm -
C.
15.4cm -
D.
17.6cm
Correct Answer: Option D
Explanation
tan 10o = (frac{x}{1})
x = 1 tan 10o = 0.176m
= 17.6cm