A grism lets astronomers study the colors of starlight.
A Dance Of Light
The interaction of light and glass is extraordinarily complex, as you can see in the video above.
Using Light To Simulate Time Travel
In a recent work published in Nature, a team simulated the possible effect of a time machine using polarized light.
Adaptation
If you’ve ever looked up in the night sky you’ve seen the twinkling of the stars. This twinkle is not due to the stars themselves, but to the turbulent motion of the Earth’s atmosphere. As starlight enters our atmosphere, the variations in density in turbulent air cause the light wave fronts to distort. So instead of reaching the telescope evenly like even rows of a band on parade, the wave fronts come in uneven and wobbly. This wobbly behavior is why stars appear to twinkle.