Light coming from the sun is white light and contains seven colours.

Draw a ray diagram showing the refraction of light through a glass prism and mark the following:
$(a)$ Incident ray
$(b)$ Emergent ray
$(c)$ Refracted ray
$(d)$ Angle of incidence
$(e)$ Angle of deviation
$(f)$ Angle of emergence

What is the phenomenon of splitting of white light into its seven constituent colors called?

Which of the following phenomena is $NOT$ involved in the formation of a rainbow?

Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also,indicate the order of the colours of the spectrum obtained.

Study the diagram and answer the questions that follow:
$(i)$ Identify the defect of vision represented by this diagram.
$(ii)$ List the two possible causes of this defect.
$(iii)$ With the help of a ray diagram,explain how this defect can be corrected.