SUBJECT: PHYSICS
GRADE :10
CHAPTER: LIGHT (REFLECTION AND REFRACTION)
I MCQ QUESTIONS
1. A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis; the
corresponding object is located how far from the mirror?
a. 20.0 cm
b. 15.0 cm
c. 7.5 cm
d. 5.0 cm
2. A concave mirror forms a real image at 25.0 cm from the mirror surface along the principal axis. If the
corresponding object is at a 10.0 cm distance, what is the mirror's focal length?
a. 1.4 cm
b. 16.7 cm
c. 12.4 cm
d. 7.1 cm
3. If a virtual image is formed along the principal axis 10.0 cm from a concave mirror with the focal length 15.0 cm,
what is the object distance from the mirror?
a. 30.0 cm
b. 10.0 cm
c. 12.4 cm
d. 6.0 cm
4.If a virtual image is formed 10.0 cm along the principal axis from a convex mirror of focal length -15.0 cm, what
is the object distance from the mirror?
a. 30.0 cm
b. 10.0 cm
c. 6.0 cm
d. 3.0 cm
5. Which of the following best describes the image formed by a concave mirror when the object is located
somewhere between the focal point (F) and the center of curvature (C) of the mirror?
a. virtual, upright and enlarged
c. virtual, upright and reduced
b. real, inverted and reduced
d. real, inverted and enlarged
6. Which of the following best describes the image formed by a concave mirror when the object is at a distance
further than the center of curvature (C) of the mirror?
a. virtual, erect and enlarged
c. virtual, upright and reduced
b. real, inverted and reduced
d. real, inverted and enlarged
7. Which of the following best describes the image formed by a concave mirror when the object distance from the
mirror is less than the focal length (f)?
a. virtual, upright and enlarged
c. virtual, upright and reduced
b. real, inverted and reduced
d. real and inverted
8. Which of the following best describes the image formed by a convex mirror when the object distance from the
mirror is less than the absolute value of the focal length (f)?
a. virtual, upright and enlarged
c. virtual, upright and reduced
b. real, inverted and reduced
d. real, inverted and enlarged
9.When the image of an object is seen in a concave mirror the image will.
a. always be real.
c. be either real or virtual.
b. always be virtual.
d. will always be magnified.
10. When the image of an object is seen in a convex mirror the image wil
a. always be real.
c. may be either real or virtual.
b. always be virtual.
d. will always be magnified.
11. Rays of light traveling parallel to the principal axis of a concave mirror will come together ____.
a. at the center of curvature.
c. at infinity.
b. at the focal point.
d. at a point half way to the focal point.
12.Which of the following statements is/are true of a virtual image?
a.Virtual images are always located behind the mirror.
b.Virtual images can be either upright or inverted.
cVirtual images can be magnified in size, reduced in size or the same size as the object.
dVirtual images can be formed by concave, convex and plane mirrors.
e.Virtual images are not real; thus you could never see them when sighting in a mirror.
f.Virtual images result when the reflected light rays diverge.
g.Virtual images can be projected onto a sheet of paper.
13. Which of the following statements is/are true of a real image?
a.Real images are always located behind the mirror.
b.Real images can be either upright or inverted.
c.Real images can be magnified in size, reduced in size or the same size as the object.
d.Real images can be formed by concave, convex and plane mirrors.
e.Real images are not virtual; thus you could never see them when sighting in a mirror.
f.Real images result when the reflected light rays diverge.
g.Real images can be projected onto a sheet of paper.
II Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions
selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
14.Assertion(A) : The center of curvature is not a part of the mirror. It lies outside its reflecting surface.
Reason (R) : The reflecting surface of a spherical mirror forms a part of a sphere. This sphere has a center.
15. Assertion (A) : A ray passing through the center of curvature of a concave mirror after reflection, is reflected
back along the same path.
Reason (R) : The incident rays fall on the mirror along the normal to the reflecting surface.
16.Assertion(A) : The emergent ray is parallel to the direction of the incident ray.
Reason (R) : The extent of bending of the ray of light at the opposite parallel faces (air- glass interface and glass-air
interface) of the rectangular glass slab is equal and opposite.
17.Assertion(A) : A ray of light travelling from a rarer medium to a denser medium slows down and bends away
from the normal. When it travels from a denser medium to a rarer medium, it speeds up and bends towards the
normal.
Reason (R) : The speed of light is higher in a rarer medium than a denser medium.
18. Assertion(A): The mirrors used in search lights are concave spherical.
Reason (R) : In concave spherical mirror the image formed is always virtual.
19.Assertion(A) : For observing traffic at back, the driver mirror is convex mirror.
Reason (R) : A convex mirror has much larger field of view than a plane mirror.
20.Assertion(A) : The height of an object is always considered positive.
Reason (R) : An object is always placed above the principal axis in this upward direction.
21.Assertion(A) : Refractive index has no units.
Reason (R) : The refractive index is a ratio of two similar quantities.
22.Assertion(A): A person cannot see his image in a concave mirror, unless, he is standing beyond the center of
curvature of the mirror.
Reason (R) : In a concave mirror, image formed is real provided the object is situated beyond its focus.
III . Using the information given in the below table, draw a ray diagram for each case for the image formation in
concave mirrors.
IV DEFINE THE TERMS
i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
Spherical mirrors (convex and concave )
Radius of curvature
Center of curvature
Focus point
Focal length
Pole of mirror
Reflection of light and its laws
Refraction of light and its laws