If the size of the scattering particles is large,which color of light do they scatter?

$(a)$ What is dispersion of white light? What is the cause of such dispersion? Draw a diagram to show the dispersion of white light by a glass prism.
$(b)$ $A$ glass prism is able to produce a spectrum when white light passes through it,but a glass slab does not produce any spectrum. Explain why this is so.

What is the muscular structure located behind the cornea in our eye called?

Which of the following phenomena of light are involved in the formation of a rainbow?

What is the number of receptors contained in the retina?

Explain the phenomenon of dispersion of white light through a glass prism,using a suitable ray diagram.