Electric room heaters use a concave mirror to reflect infrared (IR) radiation from hot coils. Note that

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Electric room heaters use a concave mirror to reflect infrared (IR) radiation from hot coils. Note that IR follows the same law of reflection as visible light. Given that the mirror has a radius of curvature of 50.0 cm and produces an image of the coils 3.00 m away from the mirror, where are the coils?4 h h 1 -do- 3 2 2 -di- 3 1


Strategy and Concept

We are given that the concave mirror projects a real image of the coils at an image distance di = 3.00 m. The coils are the object, and we are asked to find their location-that is, to find the object distance do. We are also given the radius of curvature of the mirror, so that its focal length is f = R/2 = 25.0 cm (positive since the mirror is concave or converging). Assuming the mirror is small compared with its radius of curvature, we can use the thin lens equations, to solve this problem.

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