What is a laser ?

Photons in a laser beam are produced by

Applications of laser technology includes

In a Young's double slit set-up, light from a laser source falls on a pair of very narrow slits separated by 1.0 micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency of the laser light is doubled, what will be the separation of the bright fringes ?

Why it is so much easier to perform interference experiments with a laser than with an ordinary light source?

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because

What is the basis of laser action?

What happens to the intensity of light from a bulb if the distance from the bulb is doubled ? As a laser beam travels across the legth of room, its intesity essentially ramain constant. What geonetrical characteristric of LASER beam is responsible for the constnat intensity which is missing in the case of light from the bulb?