AnswersELPGEQ2 MJ Science 3 - 2002100 HCPS v24Refraction and Lenses

Refraction and Lenses Answers

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Different kinds of lenses are used in eyeglasses to help people with eye conditions. Farsightedness is an eye condition in which distant objects appear clear but close objects appear blurry. Nearsightedness is an eye condition in which close objects appear clear but distant objects appear blurry.

A
Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer.
B
Concave lenses would help someone who is farsighted because the lenses make objects look smaller and closer.
C
Convex lenses would help someone who is nearsighted because the lenses can make objects look smaller and closer.
D
Convex lenses would help someone who is nearsighted because the lenses can make objects look larger and farther away.
2
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Roshan makes the table below to describe how to draw a ray diagram for a convex lens.What error did Roshan make?

Question illustration
A
The ray that goes through the center should bend and go through the focal point on the other side.
B
The ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other side.
C
The ray that goes parallel to the main axis after passing through the lens should also be parallel from the object to the lens.
D
The rays in the table describe how rays are drawn for a concave lens rather than for a convex lens.
3

The diagram shows an image produced by a lens.At which point does the image appear?

Question illustration
A
W
B
X
C
Y
D
Z
4

Which is unnecessary to include when accurately drawing ray diagrams?

A
focal point
B
lens
C
focal length
D
three easy rays
5

The picture shows rays passing through an unknown lens.Which ray would appear on a ray diagram for both a concave lens and a convex lens?

Question illustration
A
A
B
B
C
C
D
D
6

The diagram shows a clear plastic lens.A student shines a flashlight on the lens from the left side. Which best describes what happens when light rays exit the lens?

Question illustration
A
They are all refracted away from a central axis.
B
They are all refracted toward a central axis.
C
They exit parallel to the path in which they entered.
D
They exit at a slower speed from which they entered.
7

When parallel light rays exit a concave lens, the light rays

A
diverge.
B
converge.
C
come together.
D
remain parallel.
8

Danny drew a ray diagram to show the image of a plastic bottle produced by a concave lens. Which describes how the bottle should appear in the diagram?

A
The image of the bottle should appear larger than the actual bottle.
B
The image of the bottle should be upside down compared to the actual bottle.
C
The actual bottle should appear larger than the image of the bottle.
D
The actual bottle should be upside down compared to the image of the bottle.
9

Samantha is viewing a real image formed by a lens of a diamond ring. Which must be true about the image?

A
It could not be captured on film.
B
It is larger than the actual ring.
C
It was formed by a concave lens.
D
It is upside down.
10

Akio draws the ray diagram shown.Which best explains how to correct Akio’s mistake?

Question illustration
A
Change the lens so it appears convex instead of concave.
B
Move the small car so it appears on the left side of the lens.
C
Make the small car much larger than the other car.
D
Draw the top ray so that it passes through the focal point on the right.

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