
Focal Length and Lens Properties

Interactive Video
•
Physics, Science, Other
•
9th - 10th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the focal length of a lens?
The distance from the principal focus to the image
The distance from the lens to the image
The distance from the optical center to the principal focus
The distance from the lens to the object
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the principal focus of a lens?
The edge of the lens
The center of the lens
The point where rays converge
The point where rays diverge
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to parallel rays of light when they pass through a convex lens?
They reflect back
They remain parallel
They converge at the principal focus
They diverge away from the principal axis
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do rays of light coming at an angle to a lens behave?
They pass straight through without bending
They converge at the principal focus
They diverge away from the lens
They converge at a focus different from the principal focus
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a factor that affects the focal length of a lens?
The color of the lens
The refractive index of the lens material
The size of the lens
The weight of the lens
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What effect does a higher refractive index have on a lens?
It increases the focal length
It has no effect on the focal length
It decreases the focal length
It makes the lens less powerful
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the curvature of a lens affect its focal length?
Curvature has no effect on focal length
More curvature results in a shorter focal length
Less curvature results in a shorter focal length
More curvature results in a longer focal length
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