Course Contents Assignment g »Image Formation by Mirrors Timer Notes eib Evaluat

Question

Course Contents Assignment g »Image Formation by Mirrors Timer Notes eib Evaluate Feedback-Print Info Image Formation by Mirrors Due on Tuesday, May 1 at 03:00 pm (EDT) 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. The mirror has a radius of curvature of 45.0 cm and produces an image of the coils 3.20 m away from the mirror. Find the magnification of the heater element. Note that its large magnitude helps spread out the reflected energy. 15.54 Submit Answer Incorrect. Tries 2/10 Previous Tries

Explanation / Answer

focal length

f=R/2 =45/2 =22.5 cm

From thin lens formula

1/f =1/di + 1/do

1/22.5 =1/320 +1/do

do=24.2 cm

Magnification

M=-di/do =-320/24.2

M=-13.22

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