Question

1. The image distance s' for a flat mirror

Group of answer choices

a. Is always equal to s

b. Is always greater than s

c. Is always less than s

d. Can be greater than, equal to, or less than s

2. Choose all of the following that are true about refraction

Group of answer choices

Refraction is the bending of light as it goes from one medium to another

The incident angle and the refracted angle are measured from the normal

The incident angle is always larger than the refracted angle

The speed of light is always the same in both mediums (e.g. in both air and water)

3.

Which one of the following is correct?

Group of answer choices

a. Total internal reflection can only occur if n_incident > n_refracted

b. Total internal reflection can only occur if n_incident < n_refracted

c. Total internal reflection can occur for any values of n_incident and n_refracted.

4.

In this figure, we see an electric dipole in a non-uniform electric field. The "electric dipole moment" is a vector that points from the positive charge of the dipole to the negative charge.

If the dipole is free to move, it will

Group of answer choices

a. rotate until the dipole moment is opposite the field

b. rotate until the dipole moment is pointing along the field

c. move upward until the dipole moment exits the field

d. move downward until the dipole moment exits the field

Answer 1

1) the image distance s' for a flat mirror is always equal to s. It is so because the image formed by flat mirror is always at an equal distance behind the mirror as the object is in the front of mirror.

2) the correct choices are as follows

A) refraction is the bending of light as it goes from one medium to another.

B) the incident angle and the refracted angle are measured from the normal.

3) total internal reflection can occur only if n_incident > n_ refracted.