Required focal length of the projection lens
A projection lens in a slide projector is a single lens. A slide 24 mm high is to be projected in such a way that its image fills a screen 1.80 m high. The lens to screen distance is 3 m. Find out the required focal length of the projection lens.
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The time between arrivals of vehicles at a particular intersection follows an exponential probability distribution with a mean of 13 seconds.
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