Question

Why laser is preferred over ordinary light?

Answer 1

Hello friend
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Laser light  is called coherent. This means that the photons go in a uniform order.

Each photon follows what the next one does, that is why laser light comes out as a straight line.

Also because of the uniformity of laser light, the energy of a beam of laser light is generally much higher than that of normal light.
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Hope it will help you

thanks.

Answer 2

ordinary light spreads it's light all around in an area but laser light travels in a straight line in one particular desired direction so it makes the study of light much easier.

laser light is stronger than the ordinary light as it is condensed to a limited small area.

laser light can travel longer distance than the ordinary light with same energy.