Q10 of 223 Page 209

A shop security mirror 5.0 m from certain items displayed in the shop produces one-tenth magnification.

(a) What is the type of mirror ?


(b) What is the radius of curvature of the mirror ?

(a) the type of mirror is Convex mirror

(b) Magnification = 1/10 = v/u


u = 10v


Object distance = 5m


Using mirror formula,


Focal length = 4.5m


Radius of curvature = 2f=9m0


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9

Draw a diagram to represent a convex mirror. On this diagram mark principal axis, principal focus F and the centre of curvature C if the focal length of convex mirror is 3 cm.

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An object 1 cm tall is placed 30 cm in front of a convex mirror of focal length 20 cm. Find the size and position of the image formed by the convex mirror.

 11

An object is placed 15 cm from

(a) a converging mirror, and


(b) a diverging mirror, of radius of curvature 20 m. Calculate the image position and magnification in each case.

 12

An object 20cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. Determine the magnification of the image and the type of mirror used.