Short Answer TypeWhat is meant by coherent sources of light?
Sources of light that emit light waves having constant or zero phase difference is known as coherent sources of light. 
or constant.
A ray of light is incident on a transparent medium at polarising angle. What is the angle between the reflected ray and the refracted ray?
How does the focal length of a convex lens change with increase in wavelength of the incident light?
With reference to the photoelectric effect, what is meant by the threshold wavelength?
Half life of a certain radioactive element is 3.465 days. Find its disintegration constant.
Binding energy per nucleon for helium nucleus 
is 7.0 MeV. Find the value of mass defect for helium nucleus.
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