Name the phenomenon which causes the twinkling of stars.

Name some everyday objects:

(a) which reflect all the colors in sunlight

(b) which absorb all the colors in sunlight

Where in nature can you find evidence that white sunlight may be made of different colours?

Name two effects produced by the atmospheric refraction.

Which phenomenon makes us see the sun:

(a) a few minutes before actual sunrise?

(b) a few minutes after actual sunset?