4. Optics

4.1. A point light source S is on the axis of

a hollow cone with a mirror inner surface

(Fig. 115). A converging lens produces on a

Scree,

Fig. 115

screen the image of the source formed by the

rays undergoing a single reflection at the

inner surface (direct rays from the source

do not fall on the lens).

4. 4

Fig. 116 Fig. 117

What will happen to the image if the lens

is covered by diaphragms like those shown

in Figs. 116 and 117?

7*