PHY101 Final Term Past Papers Mcqs:
1.A concave spherical mirror has
a focal length of 12 cm. If an object is placed 18 cm in front of
it the image position is:
A. 7.2 cm behind
the mirror
B. 7.2 cm in front
of the mirror
C. 36 cm behind the mirror
D. 36 cm in front of the mirror
E. at infinity
ans: D
2. A convex spherical mirror has
a focal length of 12 cm. If an object is placed 6 cm in front of it
the image position is:
A. 4 cm behind the mirror
B. 4 cm in front of the mirror
C. 12 cm behind the mirror
D. 12 cm in front of the mirror
E. at infinity
ans: A
3. A concave spherical mirror has
a focal length of 12 cm. If an erect object is placed 6 cm in front of it:
A. the magnification is 2 and the
image is erect
B. the magnification is 2 and the
image is inverted
C. the magnification is 0.67 and the
image is erect
D. the magnification is 0.67 and the
image is inverted
E. the magnification is 0.5 and the
image is erect
ans: A
4. An erect object is located on
the central axis of a spherical mirror. The magnification is −3.
This means:
A. its image is real, inverted,
and on the same side of the mirror
B. its image is virtual, erect,
and on the opposite side of the mirror
C. its image is real, erect, and
on the same side of the mirror
D. its image is real, inverted,
and on the opposite side of the mirror
E. its image is virtual,
inverted, and on the opposite side of the mirror
ans: A
5.A concave refracting surface is
one with a center of curvature:
A. to the left of the surface
B. to the right of the surface
C. on the side of the incident
light
D. on the side of the refracted
light
E. on the side with the higher
index of refraction
ans: C
6. A convex refracting surface
has a radius of 12 cm. Light is incident in air (n = 1) and is
refracted into a medium with an
index of refraction of 2. Light incident parallel to the central
axis is focused at a point:
A. 3 cm from the surface
B. 6 cm from the surface
C. 12 cm from the surface
D. 18 cm from the surface
E. 24 cm from the surface
ans: E
7. A convex refracting surface
has a radius of 12 cm. Light is incident in air (n = 1) and refractedinto a medium
with an index of refraction of 2. To obtain light with rays parallel to the
central axis after refraction a point source should be placed on the axis:
A. 3 cm from the surface
B. 6 cm from the surface
C. 12 cm from the surface
D. 18 cm from the surface
E. 24 cm from the surface
ans: C
8. A concave refracting surface
of a medium with index of refraction n produces a real image no matter where an object is
placed outside:
A. always
B. only if the index of
refraction of the surrounding medium is less than n
C. only if the index of
refraction of the surrounding medium is greater than n
D. never
E. none of the above
ans: E
9. A convex spherical refracting
surface separates a medium with index of refraction 2 from air.
The image of an object outside
the surface is real:
A. always
B. never
C. only if it is close to the
surface
D. only if it is far from the
surface
E. only if the radius of
curvature is small
ans: D
10. A convex spherical surface
with radius r separates a medium with index of refraction 2 from
air. As an object is moved toward
the surface from far away along the central axis, its image:
A. changes from virtual to real
when it is r/2 from the surface
B. changes from virtual to real
when it is r from the surface
C. changes from real to virtual
when it is r/2 from the surface
D. changes from real to virtual
when it is r from the surface
E. remains real
Ans: E
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