What is the primary assumption of the ray model of light?
Geometric Optics: Crash Course Physics

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Physics
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9th - 10th Grade
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Light travels in straight line paths called rays.
Light travels in curved paths.
Light travels in zigzag patterns.
Light travels in circular paths.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to light when it moves from air into water?
It speeds up and travels in a straight line.
It slows down and bends away from the normal.
It speeds up and bends towards the normal.
It slows down and bends towards the normal.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What type of image is formed when light rays actually converge at a point?
Virtual image
Real image
Inverted image
Magnified image
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does a convex lens affect parallel rays of light?
It converges them towards the central axis.
It diverges them away from the central axis.
It scatters them randomly.
It reflects them back in the same direction.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the thin lens equation used for?
Measuring the angle of incidence.
Calculating the speed of light in a medium.
Determining the focal length of a lens.
Relating object distance, image distance, and focal length.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the shape of a diverging lens?
Convex
Flat
Concave
Cylindrical
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is magnification defined in optics?
The ratio of the object distance to the image distance.
The ratio of the image height to the object height.
The ratio of the focal length to the object distance.
The ratio of the speed of light in a vacuum to the speed in a medium.
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