Postulates of Newton’s corpuscular theory:
i. Every source of light emits large number of tiny particles known as ‘corpuscles’ in a medium surrounding the source.
ii. These corpuscles are perfectly elastic, rigid and weightless.
iii. The corpuscles travel in a straight line with very high speeds which are different in different media.
iv. One gets a sensation of light when the corpuscles fall on the retina.
v. Different colours of light are due to different sizes of corpuscles.
