What is tyndall effect? Explain with an example?

Draw a ray diagram to show the refraction of light through a glass prism. Mark on it,

1. The incident ray,
2. The emergent ray,
3. The angle of deviation.

Name the cells on the retina of an eye which are sensitive to

1. Dright light.
2. Dim light.
3. Sensation of colour.

Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.

State the role of ciliary muscles in accommodation.

Why does the sky appear dark (or black) to an astronaut instead of blue?

Explain why the planets do not twinkle but the stars twinkle.

How it can be proved that the basic structure of the modern periodic table is based on the electronic configuration of atoms of different elements?

No rainbow could be observed from the surface of Moon by the astronauts. What could be the possible reason?

Draw ray diagrams each showing:Hypermetropic eye.