ASVAB General Science Optics Practice Test 293624

Question 1 of 5
Refractive Index

The speed of light varies based on the material that the waves are passing through. The refractive index of a material indicates how easily light travels through it compared to how easily light travels through a vacuum. For example, the refractive index of water is 1.33, meaning that light travels 1.33 times faster in a vacuum than it does in water.

Water has a refractive index of 1.33. Which of the following is true?

light travels 1.33 times slower in a vacuum than it does in water

light travels 1.33 times faster in a vacuum than it does in water

light is 1.33 times brighter in a vacuum than it is in water

light is 1.33 times dimmer in a vacuum than it is in water