Why can't we obtain interference using two independent source of light?

How can we obtain different gases from air?

Can two independent source of light produce interference?

What are coherent source of light? Why no interference pattern is observed when two coherent source are too close

A LASER is a source- of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source 'of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?

Two independent sources of light cannot be coherent. Why?

What is the effect on the interference fringes in Young's double slit experiment when the monochromatic source is replaced by a source of white light?

We do not see an interference pattern when light from two identical electric bulbs falls on a white wall. Give reasons.