If a light ray from a candle strikes a mirror at an angle of 40° with the normal, at what angle will the ray reflect?
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a. 20°
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b.
25°
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0
0

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up