2. The Apollo 11 astronauts set up à pane QC ner-cube retroreflectors on the Moon's surface (Fig. 34.8a). The speed of light can be found by measuring the time interval required for a laser beam to travel from the Earth, reflect from the panel, and return to the Earth. Assume this interval is measured to be 2.51 s at a station where the Moon is at the zenith and take the center-to-center distance from the Earth to the Moon to be equal to 3.84 × 10% m. (a) VWhat is the measured speed of light? (b) Explain whether it is nec- essary to consider the sizes of the Earth and the Moon in

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.