One of the round faces of a solid 3.25 m cylindrical plastic tube is covered with a thin black coating that completely blocks light. The opposite side is covered in a fluorescent coating that glows when light hits it. In the center of the black face, two parallel, straight and thin slits are made, 0.225 mm apart. When laser light with a wavelength of 632.8 nm and perpendicular to the black face passes through these slits, it is observed that the central bright band on the opposite face is 5.82 mm wide, measured between the dark bands that limit it to each side, What is the index of refraction of the plastic?

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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.