How is the eye lens held in its position?

List two causes leading to myopia of the eye. Draw ray diagrams to show the image formation in case of a defective eye and a corrected eye.

When red and green light overlap,what color does that region appear?

$A$ person has to use a concave lens in his spectacles. Which defect of vision is he suffering from?

$A$ person is able to see objects clearly only when these are lying at distances between $50 \text{ cm}$ and $300 \text{ cm}$ from his eye. Identify the kind of defects of vision he is suffering from. Give reason for your answer.

Every colour travels with the same speed in a transparent medium.