Answer the following questions:
1. State any five characteristics of light.
a. Light is a form of .
b. Light always travels along a .
c. Light any medium for its propagation.
d. can even travel through vacuum.
2. Describe the ray diagram rules used to locate images formed by a convex lens.
a. When a ray of light strikes the concave lens obliquely at its optical centre, it continues to follow its path .
b. When rays parallel to the principal axis strikes a convex or concave lens, the refracted rays are converged to (convex lens) or appear to diverge from (concave lens) the .
c. When a ray passing through (convex lens) or directed towards (concave lens) the principal focus strikes a convex or concave lens, the refracted ray will be parallel to the .
d. When a ray of light strikes the convex lens obliquely at its optical centre, it continues to follow its path .