A light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm.

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I guess the problem is asking for the position of the image. We can solve the problem by using the mirror equation: where f is the focal length of the mirror is the distance of the object from the mirror is the distance of the image from the mirror For the sign convention, the focal length is taken as positive in a concave mirror. If we use f=8 cm and in the equation, we can find the position of the image: from which we find and the positive sign means the image is real.

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