Light from a laser penetrates a glass block at A and emerges at B; see figure. The glass block has a length L = 54.7 cm and a refractive index n = 1.63. The angle incidence is θ = 24.0 °. Determine the time required for the light to pass through the block.

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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.