(i)(2') A telephoto lens consists of a positive lens and a negative lens. The positive lens converges the light to the negative lens which is close to the film. focal length is very long. (ii) (8')Using the equations: lh' = f ?f? , hr = ? X ? --,where f 21500111111 '39 "1'2 It extends cone of light so the effective 1 ?= =? +? ?? ? =_+_ '3 ? ? :11 2