When white light is incident on an object and it reflects all its constituent colors,what color does it appear to be?

$A$ person with defective vision is unable to see objects nearer than $1.5 \ m$. He wants to read books at a distance of $30 \ cm$. Find the nature, focal length, and power of the lens he needs in his spectacles.

In the dispersion of white light by a prism,which color of light has the maximum velocity?

Draw ray diagrams each showing $(i)$ myopic eye and $(ii)$ hypermetropic eye.

Chickens can see only in bright light. What type of cells is present in their retina?

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