How 3D holograms work

The video explains holograms, which are flat 2D films that appear 3D due to motion parallax. Unlike photographs, holograms show different images based on the viewer's position. The creation of holograms involves splitting a laser beam into object and reference beams, which create interference patterns encoding 3D information. Holograms can reproduce the original object beam, making them indistinguishable from the real object. Additionally, each part of a hologram contains the entire image, unlike photographs. The video also clarifies that the Tupac hologram was a stage trick called Pepper's ghost.

What is a key feature of holograms that makes them appear 3D?

• They have motion parallax.

• They are made of 3D films.

• They are always colorful.

• They use white light.

How do holograms differ from 3D movies?

• Holograms provide a stereoscopic view.

• 3D movies have motion parallax.

• Holograms are always in color.

• 3D movies are more realistic.

What is the role of the reference beam in creating a hologram?

• It provides color to the hologram.

• It creates a shadow effect.

• It helps form the interference pattern.

• It makes the hologram move.

What happens when you send a laser beam through the back of a holographic film?

• It erases the interference pattern.

• It changes the color of the hologram.

• It reproduces the original object beam.

• It creates a new hologram.

What is a unique property of holograms compared to photographs?

• They can be viewed in the dark.

• They show different images from different angles.

• They require special glasses to view.

• They are always black and white.