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A light bulb, a lens, and a screen are mounted on a metre stick, such that...

A light bulb, a lens, and a screen are mounted on a metre stick, such that the bulb is at the 10 cm mark and an image forms on the screen when it is at the 90 cm mark. The image is three times the size of the bulb and is inverted. Using the ray tracing technique, find a) the location of the lens. b) the focal length of the lens.

a) lens is at the 30 cm mark

b) f = 15cm

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