Question

Convex and Concave Lenses

Aila is constructing a model of a biconvex lens. She illustrates horizontal lines to represent light rays moving towards the lens.

How should Aila depict the light rays after they pass through the lens?
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1 point
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Aila should illustrate them diffracting and moving in an upward direction.
Aila should depict them diverging without intersecting.
Aila should illustrate them converging toward a focal point.
Aila should depict them continuing in the same direction.
Which image illustrates the behavior of light upon encountering a convex lens?
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1 point

A

B

C

D
A model of a concave lens is shown below.

Which of the following statements describes a possible way to apply this type of lens?
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1 point
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Concave lenses can be used in mirrors to make objects appear closer than they really are.
Concave lenses can be used in laser pointers to intersect the projected light to a single point.
Concave lenses can be used in car headlights to expand the projected light outwards.
Concave lenses can be used in microscopes to make microscopic objects visible.
A student is constructing a representation of a concave lens. The diagram illustrates her unfinished model.

Which step would most effectively finalize her model?
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1 point
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The student should depict the light rays entering the lens and then emerging in a straight trajectory.
The student should illustrate the light entering the lens and then departing in lines that are spreading out.
The student should sketch the light rays entering the lens and then exiting at right angles.
The student should illustrate the light entering the lens and then emerging in converging lines.
What enables a convex lens to project an image onto a screen?
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1 point
The lens refracts light outward, generating a virtual image.
The lens refracts light outward, forming a real image.
The lens refracts light inward, generating a virtual image.
The lens refracts light inward, producing a real image.

Answer 1

1) Aila should illustrate them converging toward a focal point.

2) Choose the image that shows the rays converging to a single focal point after passing through the lens (i.e., the picture where the rays meet on the far side of the lens).

3) Concave lenses can be used in car headlights to expand the projected light outwards.

4) The student should illustrate the light entering the lens and then departing in lines that are spreading out.

5) The lens refracts light inward, producing a real image.