# Lesson Worksheet: Concave Mirrors Science

In this worksheet, we will practice describing the reflection of light rays from a concave mirror.

Q1:

The focal length of a concave mirror is 2.5 cm. Which one of the following sentences correctly describes the center of curvature?

• AThe center of curvature is 5 cm from the center of the surface of the mirror.
• BThe center of curvature is 10 cm from the focal point of the mirror.
• CThe center of curvature is 10 cm from the center of the surface of the mirror.
• DThe center of curvature is 5 cm from the focal point of the mirror.

Q2:

The radius of curvature of a concave mirror is 5 cm. Which one of the following sentences correctly describes the focal length?

• AThe focal length is 5 cm and is the distance from the center of the surface of the mirror to the focal point.
• BThe focal length is 2.5 cm and is the distance from the center of the surface of the mirror to the center of curvature.
• CThe focal length is 5 cm and is the distance from the center of the surface of the mirror to the center of curvature.
• DThe focal length is 2.5 cm and is the distance from the center of the surface of the mirror to the focal point.

Q3:

Which of the following sentences is the correct description of what will happen to parallel rays incident on a concave mirror?

• AThey will not be focused at a point at all.
• BThey will be focused at the center of curvature.
• CThey will be focused at the focal point.
• DThey will continue undisturbed.

Q4:

For any spherical mirror, the distance between the center of curvature and the center of the surface is just the radius of that sphere. Which one of the following sentences correctly describes the location of the center of curvature of a concave mirror?

• AThe center of curvature of a concave mirror will always be on the same side as the observer.
• BThe center of curvature of a concave mirror will always be on the side opposite to the observer.
• CDepending on the path of the light rays, the center of curvature of a concave mirror can sometimes be on the side opposite to the observer and can sometimes be on the same side as the observer.

Q5:

Which of the mirrors in the diagram below is a concave mirror? Incident light is shown by the yellow lines. • AMirror 1
• BMirror 2

Q6:

Below is a ray diagram for a concave mirror. Which one of the five locations along the optical axis represents the center of curvature of the spherical mirror? Q7:

Which one of the distances shown on the diagram below is the focal length of a concave mirror? Q8:

The ray diagram below shows different paths taken by parallel rays after they reflect off a concave mirror. Which of the paths is correct? • APath 1, because a concave mirror will focus the incident light at a point
• BPath 2, because a concave mirror will not focus the incident light at a point

Q9:

There are three concave mirrors available for an experiment involving parallel light rays. Mirror 1 has a radius of curvature of 5.4 cm. Mirror 2 has a focal length of 4.5 cm. For mirror 3, the distance between its focal point and its center of curvature is 4.0 cm. The experiment will get the best results using the mirror with the largest radius of curvature. Which mirror should be used for the experiment?

• AMirror 1 has the largest radius of curvature, 10.8 cm; therefore, it should be used for the experiment.
• BMirror 3 has the largest radius of curvature, 12.0 cm; therefore, it should be used for the experiment.
• CMirror 1 has the largest radius of curvature, 5.4 cm; therefore, it should be used for the experiment.
• DMirror 2 has the largest radius of curvature, 9 cm; therefore, it should be used for the experiment.
• EMirror 1 has the largest radius of curvature, 2.7 cm; therefore, it should be used for the experiment.

Q10:

What is the relation between the focal length of a spherical mirror and the radius of curvature of the mirror?

• AThe focal length of a spherical mirror is double the radius of curvature of the mirror.
• BThe focal length of a spherical mirror is equal to the radius of curvature of the mirror.
• CThe focal length of a spherical mirror is half of the radius of curvature of the mirror.