Respected sir/mam, 
What is light, is it a object which we can only see but cannot fell; if so does light has mass and energy?

Asked by ranksahoo | 29th May, 2017, 12:00: PM

Expert Answer:

Light is not a physical object. It is an electromagnetic wave which can be seen by humans but not felt.
An electromagnetic wave is a wave which has an electric as well as a magnetic field associated with it. Due to this, it can travel through a vacuum.
From the above statements, it is clear that light is a wave. But, it also behaves like a particle. So, we can conclude that light exhibits wave-particle duality. Light is composed of tiny packets called photons. Now, photons do not have mass. Hence, light does not have mass. But, it has energy and momentum.

Answered by Romal Bhansali | 30th May, 2017, 10:52: AM