K.C.S.E Physics Q & A - MODEL 2003PP2QN07

K.C.S.E Physics Q & A - MODEL 2003PP2QN07

 a) Fig. 8. shows an experimental set up consisting of a mounted lens. L, a screen, s, a meter rule and a candle.

​(i) Describe how the set-up may be used to determine the focal length, f, of the lens.
(ii) State the reason why the set-up would not work if the lens were replaced with a diverging lens.
(b) The graph in figure 9. shows the relationship between 1/r and 1/v for converging lens where u and v are the object and image distances respectively.

​For the graph, determine the focal length, f of lens.
(c) An object placed 15cm from a convex lens is magnified two times. Determine the focal length of the lens.

answers