What would have been the colour of the earth's sky if there were no atmosphere?

What is near-sightedness?

Which of the following colors is not a primary color?

When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?

Describe an experiment to discuss the recombination of dispersed light.

The figure below shows a glass prism placed in the minimum deviation position. $A$ ray of monochromatic light is incident on its face $AB$. Copy the diagram and show the refracted and the emergent ray. Mark the angle of deviation. State any two factors on which the angle of deviation depends.