Chap. 23 Conceptual Modules Giancoli

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Geometric Optics Conceptual MC Questions
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If the image distance is positive, the image
formed is a (A) real image. (B) virtual
image.
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If the image distance is negative, the image
formed is a (A) real image. (B) virtual
image.
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If the magnification is a positive value, the
image is (A) upright. (B) inverted.
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If the magnification is a negative value, the
image is (A) upright. (B) inverted.
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If the absolute value of the magnification is
larger than one, then the image is (A) larger
than the object. (B) the same size as the
object. (C) smaller than the object.
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If the absolute value of the magnification is
smaller than one, then the image is (A) larger
than the object. (B) the same size as the
object. (C) smaller than the object.
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If the absolute value of the magnification is
equal to one, then the image is (A) larger
than the object. (B) the same size as the
object. (C) smaller than the object.
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For all transparent material substances, the
index of refraction (A) is less than 1. (B)
is greater than 1. (C) is equal to 1. (D)
could be any of the given answers it all depends
on optical density.
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An index of refraction less than one for a medium
would imply (A) that the speed of light in the
medium is the same as the speed of
light in vacuum. (B) that the speed of light in
the medium is greater than the speed of
light in vacuum. (C) refraction is not
possible. (D) reflection is not possible.
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The index of refraction of diamond is 2.42. This
means that a given frequency of light travels
(A) 2.42 times faster in air than it does in
diamond. (B) 2.42 times faster in diamond than
it does in air. (C) 2.42 times faster in vacuum
than it does in diamond. (D) 2.42 times faster
in diamond than it does in vacuum.
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The angle of incidence (A) must equal the angle
of refraction. (B) is always less than the
angle of refraction. (C) is always greater than
the angle of refraction. (D) may be greater
than, less than, or equal to the angle of
refraction.
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Light traveling at an angle into a denser medium
is refracted (A) toward the normal. (B) away
from the normal. (C) parallel to the normal.
(D) equally.
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Light enters air from water. The angle of
refraction will be (A) greater than the angle
of incidence. (B) equal to the angle of
incidence. (C) less than the angle of
incidence.
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A ray of light, which is traveling in air, is
incident on a glass plate at a 45 angle. The
angle of refraction in the glass (A) is less
than 45. (B) is greater than 45. (C) is
equal to 45. (D) could be any of the above it
all depends on the index of refraction of glass.
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The principle on which fiber optics is based is
(A) refraction. (B) polarization. (C)
dispersion. (D) total internal reflection.
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The critical angle for a beam of light passing
from water into air is 48.8. This means that
all light rays with an angle of incidence greater
than this angle will be (A) absorbed. (B)
totally reflected. (C) partially reflected and
partially transmitted. (D) totally transmitted.
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The principle on which lenses work is (A)
refraction. (B) polarization. (C) dispersion.
(D) total internal reflection.
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Lenses that are thickest at the center called
(A) converging lenses. (B) diverging lenses.
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Lenses that are thinner at the center than the
edges are called (A) converging lenses. (B)
diverging lenses.
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Lenses that are thicker at the center (A)
spread out light rays. (B) bend light rays to a
point beyond the lens. (C) have no effect on
light rays. (D) reflect light rays back.
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A light ray, traveling parallel to the axis of a
convex thin lens, strikes the lens near its
midpoint. After traveling through the lens, this
ray emerges traveling obliquely to the axis of
the lens (A) such that it never crosses the
axis. (B) crossing the axis at a point equal to
twice the focal length. (C) passing between the
lens and its focal point. (D) passing through
its focal point.
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A convex lens has focal length f. An object is
located at infinity. The image formed is located
(A) at 2f. (B) between f and 2f. (C) at f.
(D) between the lens and f.
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A convex lens has a focal length f. An object is
placed at f on the axis. The image formed is
located (A) at infinity. (B) between 2f and
infinity. (C) at 2f. (D) between f and 2f.
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A convex lens has focal length f. An object is
placed at 2f on the axis. The image formed is
located (A) at 2f. (B) between f and 2f.
(C) at f. (D) between the lens and f.
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A convex lens has a focal length f. An object is
placed between f and 2f on the axis. The image
formed is located (A) at 2f. (B) between f
and 2f. (C) at f. (D) at a distance greater
than 2f from the lens.
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A convex lens has a focal length f. An object is
placed between infinity and 2f from the lens on
its axis. The image formed is located (A) at
2f. (B) between f and 2f. (C) at f. (D)
between the lens and f. 23.7-23.8
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A object is placed between a convex lens and its
focal point. The image formed is (A) virtual
and erect. (B) virtual and inverted. (C) real
and erect. (D) real and inverted.
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The images formed by concave lenses (A) are
always real. (B) are always virtual. (C)
could be real or virtual it depends on whether
the object distance is smaller or
greater than the focal length. (D) could be
real or virtual, but always real when the object
is placed at the focal point.
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END