Concept Based
Q. 1. Why does a ray of light passing through the centre of curvature of a concave mirror gets reflected along same path after reflection?
Q. 2. What kind of image is formed on a cinema screen?
Q. 3. What do you mean
by laterally inverted?
Q.4. What
is the difference between virtual images produced by concave, plane and convex
mirrors?
Q.5. For
driving a car what type of mirror would you prefer to see the traffic at your
back and why? Explain why it is preferred over a plane mirror?
Q.6 An erect
image three times the size of the object is formed with a concave mirror of
radius of curvature 36 cm. What is the position of the image?
Q.7.
Discuss the position and nature of the image formed by a concave mirror when
the object is moved from infinity towards the pole of mirror.
Q.8 Find
the position, nature and size of the image of an object 3 cm high place at a
distance of 9 cm from a concave mirror of focal length 18 cm.
Q.9. With
the help of ray diagrams, show the formation of image of an object by a concave
mirror. When it is placed: (i) beyond the centre of curvature (ii) at the
centre of curvature.
MCQ
Q.1. Multiple images are
formed by a thick plane mirror. Which of the following is the brightest of all
the images?
A. First
B. second
C. third
D. fourth
Q. 2. A plane mirror is
placed vertically facing due north. An arrow pointing north-east is kept in
front of the mirror. In which direction will the arrow point in this image?
A. north-east
B. south-east
C. south-west
D. north-west
Q. 3. When a plane mirror is
rotated through a certain angle, the reflected ray turns through twice as much
and the size of the image:
A. is doubled
B. is halved
C. becomes infinite
D. remains same
Q.4. The image formed by a
convex mirror is only one-third of the size of the object. If the focal length
of the mirror is 12 cm, the image formed will be
A. 8 cm behind the mirror
B. 10 cm behind the mirror
C. 8 cm in front of the
mirror
D. 10 cm in front of the mirror
Q.5. A beam of light
incident on a plane mirror forms a real image on reflection. The incident beam
is:
A. parallel
B. convergent
C. divergent
D. not certain
Q.6. If an object is placed
symmetrically between two plane mirrors, inclined at an angle of 72°, then
total number of images formed is:
A. 5
B. 4
C. 2
D. infinite
Q.7. A plane mirror produces
a magnification of:
A. -1
B. + 1
C. zero
D. between 0 and infinity
Q. 8. A dice is place with
one of its edges parallel to the principal axis between the principal focus and
the centre of curvature of concave mirror. Then the final image has the shape
of:
A. cube
B. rectangular
parallelepiped
C. barrel shape
D. spherical
Q.9. Two adjacent walls and
the ceiling of a rectangular room are mirror surfaced. The number of images of
himself that an observer sees is:
A. 3
B. 9
C. 6
D. 8
Q. 10. Image formed by a
convex spherical mirror is:
A. virtual
B. real
C. enlarged
D. inverted
Q.11. A diminished virtual
image can be obtained only in:
A. plane mirror
B. concave mirror
C. convex mirror
D. all of these
Q. 12. A convex mirror has a
focal length f. A real object is placed at a distance f in front of it. The
mirror produces an image at:
A. infinity
B. f
C. f/2
D. 2f
Q. 13. A light ray incident
normally on a plane mirror suffers deviation of:
A. zero
B. 90°
C. 180°
D. 360°
Q. 14. A convex mirror is
used to form the image of a real object. Then tick the wrong statement:
A. image lies between the
pole and the focus
B. image lies is diminished
in size
C. image is erect
D. image is real
Q.15. An object is placed at
a distance of 40 cm in front of a concave mirror of focal length 20 cm. The
image produced is:
A. virtual and inverted
B. real and erect
C. real, inverted and
diminished
D. real, inverted and of same size
Q. 16. Two plane mirrors are
at right angles to each other. A man stands between them and combs his hair
with the right hand. In how many images will he be seen using his left hand?
A. none
B. 1
C. 2
D. 3
Comprehensive Exercises (T/F)
1. Laws
of reflection are true only for plane mirror and not for curved mirrors.
2. The radius of curvature of a spherical mirror
is half of the focal length.
3. The
rays travelling parallel to the principal axis after reflecting from the
concave mirror pass or appear to pass throng the focus.
4. Convex mirror can be used to see large image of small object.
5. A
convex mirror always forms a virtual and erect image.
6. A
concave mirror can be used to obtain a parallel beam of light from a small
lamp.
7. A
plane mirror can be used to form a real image equal in size as of the object.
8. A
virtual, magnified and erect image can be formed by a concave mirror.
9. When a
plane mirror is turned by a angle θ, the reflected rays turns by an angle θ.
10. In a
plane mirror, the distance between image and the mirror is the same as distance
between object and the mirror.
11. If an
object is placed in between two plane mirrors inclined at and angle 45°, then
the number of image formed will be 9.
12. Mirror
formula is relation between height of the image and the height of the object.
13. Mirror
formula is the same irrespective of convex mirror or a concave mirror.
14. Magnification equation is the same irrespective of convex mirror and concave mirror.
