What is used to generate interference patterns in order to produce a hologram? shadows spectrometers lasers prisms

Answer;

Laser

Explanation;Holograms are created using lasers because unlike regular light the laser coherent. This means that the light waves in a laser beam are the same size which means they will bend the same way, and will vibrate at the same time.Holograms are created using a single laser beam. The single laser beam is split into two beams using a special lens to get two laser beams that are exactly similar. One laser beam which is the reference beam is directed onto the film while the second beam is reflected off of the object used. When the two laser beams meet and overlap creating an interference pattern.

I believe the answer you are looking for is Lasers. 

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