Question: Viewing screen P Source Mirror Interference effects are produced at point P on a screen as a result of direct rays from a 560 nm

Viewing screen P Source Mirror Interference effects are produced at point P on a screen as a result of direct rays from a 560 nm source and reflected rays from the mirror, as shown. Assume the source is 90 m to the left of the screen and 1.10 cm above the mirror. Find the distance y to the first dark band above the mirror. (Find y in centimetres to the nearest 0.01cm.)
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