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.
In a projector, the object is placed
(A) between the lens and its focal point.
No. --- That would make it a magnifier.
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.
In a projector, the object is placed
(C) at the focal point of the lens.
No. That would give no image at all.
In a projector, the object is placed
(D) far beyond the focal point of the lens.
No. --- That would make it a camera.
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.
In a magnifier, the object is placed
(A) between the lens and its focal point.
Yes. --- A virtual image results.
In a magnifier, the object is placed
(B) just beyond the focal point of the lens.
No. --- That would make a projector.
In a magnifier, the object is placed
(C) at the focal point of the lens.
No. --- That would make no image at all.
In a magnifier, the object is placed
(D) far beyond the focal point of the lens.
No. --- That would be OK for a camera.
(A) anything.
(B) objects at a distance.
(C) objects nearby.
(D) objects which are moving.
(A) anything.
No. --- Unless his correction is really large.
(B) objects at a distance.
No. --- The rays from such objects are not diverging much.
(D) objects which are moving.
No. --- He needs extra convergence to bring rays to a focus.
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.
An astronomical telescope can be thought of as
(A) one magnifier looking at the image from another.
No. --- That would be a compound magnifier.
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.
An astronomical telescope can be thought of as
(C) a magnifier looking at a projector image.
No. --- That would be a compound microscope.
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.