P. 4163. Use a converging lens of diameter d and of power D dioptre and project the image of the Sun onto a white screen.
a) What is the size of the Sun on the screen?
b) By what factor will the image of the Sun on the screen be brighter than the rest of the screen which is directly shone by the Sun?
The angle subtended by the Sun is 32 arcminutes.
Data: D1=12 m-1, d1=35 mm; and , d2=60 cm.