Optical Instruments - Questions

Optical Instruments
































In a projector, the object is placed

(A) between the lens and its focal point.
(B) just beyond the focal point of the lens.
(C) at the focal point of the lens.
(D) far beyond the focal point of the lens.

Questions --- What this question is about
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In a projector, the object is placed

(A) between the lens and its focal point.

No. --- That would make it a magnifier.

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Questions --- What this question is about
107.1
































In a projector, the object is placed

(B) just beyond the focal point of the lens.

Yes. --- That gives a real image far beyond the other focal point.

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Questions --- What this question is about
107.1
































In a projector, the object is placed

(C) at the focal point of the lens.

No. That would give no image at all.

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Questions --- What this question is about
107.1
































In a projector, the object is placed

(D) far beyond the focal point of the lens.

No. --- That would make it a camera.

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Questions --- What this question is about
107.1































In a magnifier, the object is placed

(A) between the lens and its focal point.
(B) just beyond the focal point of the lens.
(C) at the focal point of the lens.
(D) far beyond the focal point of the lens.

Questions --- What this question is about
107.2































In a magnifier, the object is placed

(A) between the lens and its focal point.

Yes. --- A virtual image results.

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Questions --- What this question is about
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In a magnifier, the object is placed

(B) just beyond the focal point of the lens.

No. --- That would make a projector.

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Questions --- What this question is about
107.2































In a magnifier, the object is placed

(C) at the focal point of the lens.

No. --- That would make no image at all.

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Questions --- What this question is about
107.2































In a magnifier, the object is placed

(D) far beyond the focal point of the lens.

No. --- That would be OK for a camera.

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Questions --- What this question is about
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You notice that a friend's glasses make his eyes seem larger than normal. Without his glasses, your friend would most likely have trouble seeing

(A) anything.
(B) objects at a distance.
(C) objects nearby.
(D) objects which are moving.

Questions --- What this question is about
107.3

































You notice that a friend's glasses make his eyes seem larger than normal. Without his glasses, your friend would most likely have trouble seeing

(A) anything.

No. --- Unless his correction is really large.

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Questions --- What this question is about
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You notice that a friend's glasses make his eyes seem larger than normal. Without his glasses, your friend would most likely have trouble seeing

(B) objects at a distance.
No. --- The rays from such objects are not diverging much.

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Questions --- What this question is about
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You notice that a friend's glasses make his eyes seem larger than normal. Without his glasses, your friend would most likely have trouble seeing
(C) objects nearby.
Yes. --- The rays from such objects diverge a lot and he needs extra convergence to see them.

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Questions --- What this question is about
107.3

































You notice that a friend's glasses make his eyes seem larger than normal. Without his glasses, your friend would most likely have trouble seeing

(D) objects which are moving.
No. --- He needs extra convergence to bring rays to a focus.

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Questions --- What this question is about
107.3
































An astronomical telescope can be thought of as

(A) one magnifier looking at the image from another.
(B) a magnifier looking at a camera image.
(C) a magnifier looking at a projector image.
(D) a camera looking at the image formed by a magnifier.

Questions --- What this question is about
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An astronomical telescope can be thought of as

(A) one magnifier looking at the image from another.

No. --- That would be a compound magnifier.

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Questions --- What this question is about
107.4
































An astronomical telescope can be thought of as

(B) a magnifier looking at a camera image.
Yes. --- The objective lens forms a real image of a distant object and the magnifier looks at that.

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Questions --- What this question is about
107.4
































An astronomical telescope can be thought of as

(C) a magnifier looking at a projector image.

No. --- That would be a compound microscope.

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Questions --- What this question is about
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An astronomical telescope can be thought of as

(D) a camera looking at the image formed by a magnifier.
No. --- That would be just an eye looking through a magnifier.

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Questions --- What this question is about
107.4