What color does the region appear when red,green,and blue light overlap?

How is long-sightedness corrected?

Study the diagram given below and answer the questions that follow it.
$(i)$ Identify the defect of vision represented in this case. Give a reason for your answer.
$(ii)$ Mention the two causes of this defect.

What is the far point of a person with normal vision?

Which phenomenon of light is responsible for the Tyndall effect?

Which of the following is true for the eye defect known as hypermetropia (farsightedness)?