12 In an experiment to determine the focal length of a convex lens, 1/u (cmÀ1) was plotted on horizontal and 1/v (cmÀ1) on the vertical axis, where u and v have their usual meaning. What is the physical significance of the reciprocal of the slope of the graph? a) linear magnification (b)focal length (c) object distance (d) image distance
14 In an experiment with a concave mirror, the image of an optical pin which is 4 times its size was cast on on a screen 6m from the object pin. How far from the object pin should the mirror be placed? a) 8m b) 6m c) 3m d) 2m
1 A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear. (a) −4.5cm (b) −5.5cm (c) −6.5cm (d) −7.5cm
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