LIGHT REFLECTION AND REFRACTION PYQ
1. The
laws of reflection hold true for
(a) plane mirrors only
(b) concave mirrors only
(c) convex
mirrors only
(d) all reflecting surface (2020)
VSA (1 mark)
2. What is the magnification of the images
formed by plane mirrors and why?
(Delhi
2015)
3. An
optical device forms an erect image of an object placed in front of it. If the
size of the image is one half that of the object, the optical device is a
(a) concave mirror
(c) plane mirror
(b) convex
mirror
(d) convex
lens. (Term
I, 2021-22)
4. The
image of an object placed in front of a concave mirror of focal length 15 cm is
of the same size as the object. The distance between the object and its image
is
(a) 15 cm (b) 30 cm (c) 60 cm (d) zero. (Term
I, 2021-22)
5. The
relation R = 2f is valid
(a) for concave mirrors but not for convex
mirrors
(b) for
convex mirrors but not for concave mirrors
(c) neither for concave mirrors nor for convex
mirrors
(d) for both concave and convex mirrors. (Term I, 2021-22)
6. In which of the following is a concave
mirror used
(a) A solar
cooker
(b) A
rear-view mirror in vehicles
(c) A safety
mirror in shopping malls
(d) In viewing full size image of distant tall
buildings. (Term
I, 2021-22)
7.
For the
diagram shown, according to the new Cartesian sign convention the magnification
of the image formed will have the following specifications:
(a) Sign -
Positive, Value - Less than 1
(b) Sign -
Positive, Value - More than 1
(c) Sign -
Negative, Value - Less than 1
(d) Sign - Negative, Value - More than 1 (Term
I, 2021-22)
8. The
radius of curvature of a converging mirror is 30 cm. At what distance from the
mirror should an object be placed so as to obtain a virtual image?
(a) Infinity
(b)
30 cm
(c)
Between 15 cm and 30 cm (d) Between 0 cm and 15 c (Term
I, 2021-22)
VSA (1
mark)
9. Define pole of a spherical mirror. (2020 C)
SA I (2 marks)
10. Draw
a labelled ray diagram to show the path of the reflected ray corresponding to
an incident ray of light parallel to the principal axis of a convex
mirror. Mark the angle of incidence and
angle of reflection on it. (Al 2019)
11. If
the image formed by a spherical mirror for all positions of the object placed
in front of it is always erect and diminished, what type of mirror is it? Draw
a labelled ray diagram to support your answer. (2018)
12. An
object is placed at a distance of 30 cm in front of a convex mirror of focal
length 15 cm. Write four characteristics of the image formed by the mirror.
(Delhi 2017) OR List four specific characteristics of the images of the objects
formed by convex mirrors. (Delhi 2015)
13. An
object is placed at a distance of 12 cm in front of a concave mirror of radius
of curvature 30 cm. List four characteristics of the image formed by the
mirror. (Delhi 2017)
14. A ray
of light is incident on a convex mirror as shown. Redraw the diagram and
complete the path of this ray after reflection from the mirror. Mark angle of
incidence and angle of reflection on it.
15. Name
the type of mirrors used in the design of solar furnaces. Explain how high
temperature is achieved by this device. (AI 2016)
16. "The magnification produced by a
spherical mirror is -3". List four information you obtain from this
statement about the mirror/image.
(AI 2016)
17. AB
and CD, two spherical mirrors, from parts of a hollow spherical ball with its
centre at O as shown in
18. The
magnification produced when an object is placed at a distance of 20 cm from a
spherical mirror is +1/2. Where should the object be placed to reduce the
magnification to +1/3? (2023)
19.
Define the following terms in the context of a diverging mirror:
(i)
Principal focus
(ii)
Focal length (2023)
20. Draw a labelled ray diagram to illustrate your
answer.
A student
has focused the image of an object of height 3 cm on a white screen using a
concave mirror of focal length 12 cm. If the distance of the object from the
mirror is 18 cm, find the values of the following:
(i) distance of the image from the mirror.
(ii) height of the image. (2023)
21. Draw
ray diagrams for the following cases when a ray of light:
(i)
passing through centre of curvature of a concave mirror is incident on it.
(ii) parallel to principal axis is incident on
convex mirror.
(iii) is passing through focus of a concave
mirror incident on it. (2020)
LONG (5
MARKS)
22.An
object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal
length 15.0 cm.
(i) At what distance from the mirror should a
screen be placed in order to obtain a sharp image?
(ii) Find
the size of the image.
(iii)
Draw a ray diagram to show the formation of image in this case. (2020)
23. (a) A concave mirror of focal length 10 cm
can produce a magnified real as well as virtual image of an object placed in
front of it. Draw ray diagrams to justify this statement.
(b) An object is placed perpendicular to the
principal axis of a convex mirror of focal length 10 cm. The distance of the
object from the pole of the mirror is 10 cm. Find the position of the image
formed. (2020)
24. (a) A
security mirror used in a big showroom has radius of curvature 5 m. If a
customer is standing at a distance of 20 m from the cash counter, find the
position, nature and size of the image formed in the security mirror.
(b) Neha
visited a dentist in his clinic. She observed that the dentist was holding an
instrument fitted with a mirror. State the nature of this mirror and reason for
its use in the instrument used by dentist.
(2020)
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