In a normal material that is transparent to light, can you find the index of refraction to be smaller than 1?

Optical fiber can be found even in the internet connection to home. A technician who installs fiber to your house knows that s/he cannot bend the fiber too sharply. Do you know why a fiber has a minimum bending radius?

State the condition that one sees a rainbow. Do you see the red color usually at the outer radius or the inner radius of the arch? And why is this?

When you go to your dentist for an x-ray image of your teeth, the x-ray is considered to be a particle or a wave?

One can now buy a white LED, or an LED that emits white light. Can you purchase a laser that emits white light?

Can you use a very bright flashlight with an incandescent light bulb in the place of the red or green laser to perform the measurements that you did in this lab?

Is rainbow due to light interference, and why?

Is the colorful reflection of sunlight off a thin film of oil on a still pond of water due to interference?