Prescott's Microbiology 8th Edition by Joanne Willey, Linda Sherwood, Christopher J. Woolverton, Lansing Prescott, John Harley, Donald Klein

Exercise 1

Define refraction, refractive index, focal point, and focal length.

Step 1 of 4

Refraction is the bending of light due to a change in speed. Imagine looking at a straw sitting in a cup of water. The straw has a break right at the air-water interface. This is because light is being refracted as it passes between water and air.