Question

Which optical device is used to obtain a parallel beam of light from a tiny source of light?

Answer 1

PARALLEL BEAM - WHEN THE RAYS OFLIGHT TRAVEL PARALLEL TO EACH OTHER , THEN THE COLLECTION OF SUCH RAYS IS CALLED PARALLEL BEAM . 2)DIVERGENTBEAM - WHEN THE RAYS OF LIGHT START FROM A POINT AND TRAVEL IN VARIOUS DIRECTION ,THEN THE COLLECTION OF SUCH RAYS ARE CALLED DIVERGENT BEAM .
Light rays from a point source of lighttravel in all directions, moving away with time. Such a beam of light is called a divergentbeam of light. A convergent beam of light rays comes together (converges) after reflection and refraction at a single point known as the focus.