Question

Can you identify the TRUE statements about the behavior of light waves?

During refraction, waves bend when they pass from one medium to another. The waves refract because their speed changes.
The result of this interference will be a straight line.
We see this rainbow because of reflection.
We see ourselves in a mirror because light is refracted back into our eyes.
Consider the media represented by A, B, C, and D. Light travels fastest through the last layer.
This is an example of constructive interference.

Answer 1

Answer:

During refraction, waves bend when they pass from one medium to another. The waves refract because their speed changes.

Explanation:

Refraction is a phenomenon typical of light waves.

Refraction occurs when a light wave passes through the interface between two mediums: so, the light wave passes from the first medium into the second medium.

When this occurs, the speed of the wave, as well as its direction, changes.

The speed of the wave in a medium is given by:

$v=\frac{c}{n}$

where

c is the speed of light in a vacuum

n is called index of refraction of the material, and it is a positive number larger than 1, so that the speed of light in a medium is lower than the speed of light in a vacuum

The direction changes according to Snell's Law:

$n_1 sin \theta_1 = n_2 sin \theta_2$

where

n1 is the index of refraction of the first medium

n2 is the index of refraction of the 2nd medium

$\theta_1$ is the angle of incidence, which is the angle between the direction of the incident ray and the normal to the interface

$\theta_2$ is the angle of refraction, which is the angle between the direction of the refracted ray and the normal to the interface

So, the correct answer is

During refraction, waves bend when they pass from one medium to another. The waves refract because their speed changes.