S.3 Physics Exercise 2 – Light, colours and beyond
Name : _______________________ (
)
A True or false questions
Write ‘T’ for a true statement and ‘F’ for a false statement in the boxes provided.
1
2
3
When you look through a periscope, each light ray entering your eye is
reflected by two plane mirrors.
The laws of reflection do not hold for diffuse reflection.
The periscope is an application of plane mirrors.
B Multiple-choice questions
Choose the correct answer for each of the following questions.
1
Which of the following is/are the property/properties of images formed
by plane mirrors?
(1) The size of the image is the same as that of the object.
(2) The image is upside down.
(3) The image is formed on the surface of the mirror.
A
C
2
B
D
(1) and (2) only
(1), (2) and (3)
Which of the following statements is INCORRECT?
A
Only smooth surfaces can form images.
B
Only smooth surfaces can reflect light.
C
Plane mirrors are used in barbershops to help customers look at
their hair from different angles.
D
*3
(1) only
(2) and (3) only
Interior designers use plane mirrors to increase the spatial feel of a
house.
Which of the following diagrams correctly shows the object and its
image in a plane mirror?
A
B
C
D
4
5
The right diagram shows a boy in front of a
plane mirror. He is using the mirror to look
at objects P, Q, R and S behind a wall.
Which of the objects CANNOT be seen by
the boy at this position?
A
B
C
P
Q
R
D
S
plane
mirror
˙
P
˙
˙
Q
R
eye of
the boy
˙
S
wall
Which of the following are applications of plane mirrors?
(1) Daylight reflectors in some buildings
(2) Driving mirrors in private cars
(3) The kaleidoscope
A
B
C
(1) and (2) only
(1) and (3) only
(2) and (3) only
D
(1), (2) and (3)
C Fill in the blanks
Complete the following sentences.
1
When light is reflected, the incident ray, the reflected ray and the ____________________ all lie
on the same plane.
2
The left side of an object becomes the right side of the image in a plane mirror. We say the
image is ___________________________.
3
____________________ reflection occurs when light rays hit a rough surface and are reflected
in many different directions.
D Questions
1
Complete the ray diagram below by drawing all reflected rays. Indicate the values of the angle
of incidence and all angles of reflection.
(4 marks)
100
50
2
The photo below shows an illusion of a candle burning in water. The diagram shows the set-up
viewed from the top. A burning candle is put in front of a sheet of glass. A beaker of water is
then put at a suitable place on the other side of the glass sheet.
beaker
glass sheet
candle
candle
eye
a
State TWO properties of the image of the candle.
(2 marks)
_____________________________________________________________
_____________________________________________________________
*b
In the above diagram,
i
draw a ‘’ to mark the location of the image of the candle.
ii
complete the two light rays to show how they enter the eye after reflection, and
produce the reflected rays backwards with dotted lines to show how the eye sees the
candle image.
(2 marks)
iii
draw the beaker (represented by a circle) to show where you would put it to produce
the illusion.
(1 mark)
– End –
(1 mark)
Unit 15 Light, colours and beyond
Section test 1: Sections 15.1 to 15.3
A True or false questions
1 T
2 F
3 T
B Multiple-choice questions
1 A
2 B
3 C
C
1
2
3
Fill in the blanks
normal
laterally inverted
Diffuse
D
1
Questions
4 D
5 D
50
50
50
Correct reflected rays
Correct angle of incidence
Correct angles of reflection
1
a
2m
1m
1m
Any two from:
1m2
The image distance is the same as the object distance. / The image is of the same size as the
object. / The image is erect. / The image is laterally inverted.
b
i
ii
Correct location of image of candle
Correct incident and reflected rays
Correct backward extension of reflected rays
1m
1m
1m
iii
Correct location of beaker
1m
0
