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Q1. Physics instructor wants to produce a double-slit interference pattern large enough for her class to see. For the size of the room, she decides that the distance between successive bright fringes on the screen have to be at least 2.58 cm. If the slits have a separation d = 0.0270 mm, what is the minimum distance from the slits to the screen when 580 nm light is used? In cm

Q2. A thin layer of magnesium fluoride (n = 1.38) is used to coat a flint-glass lens (n = 1.61). What least thickness should the magnesium fluoride film have if the reflection of 667 nm light is to be suppressed? Suppose that the light is incident at right angles to the film. In nm.

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