Question

q3-4

Chapter -25 The Reflection of Light: Mirrors 3 - A coin is placed in front of a concave mirror that has a radius of curvature R-0.50 m The image of the coin is inverted and is five times larger than the size of the object. Determine the distance between the coin and the mirror (de). a) 0.10 m b) 0.15 m c) 0,20 m d) 0.30 m e) 0.45 m 4 - A concave mirror of radius R-54 em is used to project a slide onto a screen. The slide is located at 46 cm from the mirror, and a light bulb shines light through the slide and onto the mirror. The setup is shown in the figure. (a) How far from the screen should the mirror be located? (b) If the height of the object on slide is 0.80 cm, what is the height on the image on the screen (c) How should the slide be oriented so that the picture on the screen looks normal?

Answer 1

Since the magnification is equal tk the ratio of either the image height to the object height or also equal to the ratio of the image distance to the object distance from the mirror. So, object height/image height =5 = image distance/object distance.

Now R=0.5 so object distance will be 0.5/5=0.1 m

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