We have experienced a broadcast interruption at our transmitter site that services a large part of Central Southern Colorado. This includes the Salida region as well as the entire San Luis Valley—including Lake George, Coaldale, Del Norte and San Luis. We are actively working to assess the point of failure. Thank you for your understanding and support! Our live stream is also available online and on the RMPBS+ app.

Stream live and on-demand content now on our new app:
RMPBS+

Help tell more stories in 2026 - make a year-end gift!

Give Now
Crash Course Physics show's poster

Spectra Interference: Crash Course Physics #40

Explore the world of physics, motion, and energy with Dr. Shini Somara.

Spectra Interference: Crash Course Physics #40

Season 1 Episode 40 | 8m 21s | CC

Light is everywhere … but it’s not as predictable as you might think. It’s a wave that travels in straight lines, yet it also reflects off of surfaces, refracts through various materials, and generally changes direction all the time! We’ve learned how to bend light to our will, with lenses and mirrors, but it’s time to take a step back and ask what we can LEARN from light.

Related stories

Rocky Mountain PBS
Our cameras went to a lot of places this year. Here are our favorite shots from 2025
Rocky Mountain PBS staff share their favorite shots of the year
 | Carly Rose
Business & Economy
Tamale restaurants ready for Christmas rush
Tamales are a Christmas staple in households across North America. Here’s how Colorado restaurants get ready.
 | Cormac McCrimmon
Rocky Mountain PBS
Our favorite stories from 2025
RMPBS journalists shared the favorite stories they reported this year
 | Carly Rose

Crash Course Physics

Watch more episodes

See more
See more