science double slit experiment 3d animation, thomas young experimental physics that demonstrate the wave particle duality and quantum physics quantum mechanics wave propagation

1950s: Light beam shining though a glass box half filled with a liquid. Smoke in the box settles, causing the light beam in air to disappear. A light beam shines though a slit into a smoke filled box.

Ophthalmology, woman and machine with laser for eye exam with vision test, consultation and slit lamp at optometrist. Patient, optical tool and glaucoma check for eyesight correction or retina health