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
From the diagram above,
Tan\(\theta\) = \(\frac{\text{d}}{100}\)
Tan10º = \(\frac{\text{d}}{100}\)
d = 100 x Tan 10º = 100 x 0.1763 ≈ 17.6cm.
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