At noon,the sun appears white because:

Which color of light is scattered the most due to the atmosphere?

What is the other name of near-sightedness?

When you enter from bright sunshine into a dark room,you are not able to see clearly for some time. Why?

$(a)$ What is dispersion of white light? What is the cause of such dispersion? Draw a diagram to show the dispersion of white light by a glass prism.
$(b)$ $A$ glass prism is able to produce a spectrum when white light passes through it,but a glass slab does not produce any spectrum. Explain why this is so.

What is the eye lens made of?