UCE PHYSICS 2010 PAPER 2 QTN 4

(a) (i) What is meant by focal length of a lens?

(ii)Calculate the power of a concave lens focal length 20cm.

(b) An object of height 7.5 cm is placed at a distance of 15cm from a convex lens of focal length 20cm. by scale drawing determine the

(i) height of the image

(ii) image distance

(iii)Linear magnification.

(c ) Describe an experiment to determine the focal length of a convex lens using an illuminated object and a plane mirror.

(d) What is the main difference between the operation of a lens camera and that of a human eye?

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