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Physics for IGCSE & O level - Rays And Waves (Section 11)

1
What term is used for the angle at which total internal reflection begins to occur?
Answer
(C)
Critical angle
2
What does refraction do to light?
Answer
(D)
All the above
3
Which of the following is a necessary condition for total internal reflection to occur?
Answer
(B)
Light must be traveling from a more dense to a less dense medium
4
What are the characteristics of electromagnetic waves?
Answer
A
C
5
In which direction do electromagnetic waves travel?
Answer
(C)
In the direction of both electric and magnetic field oscillations, perpendicular to both.
6
When white light enters a prism, it separates into different colors because of what?
Answer
(B)
Refraction
7
What must light do to an object in order for you to see it?
Answer
(D)
Reflect off the object
8
What is the relationship between the refractive index and the speed of light in a medium?
Answer
(B)
Inversely proportional
9
Where does light travel?
Answer
(C)
In straight lines
10
In the context of refraction, what is the name of the phenomenon where light bends as it passes from one medium to another?
Answer
(C)
Refraction
11
What is a function of a regenerative in the context of digital transmission?
Answer
(A)
Amplify the signal.
12
What is the process of light passing through an object and bending called?
Answer
(B)
Refraction
13
What is the approximate speed of all electromagnetic waves?
Answer
(A)
300,000 km/s
14
What is the critical angle?
Answer
(A)
The angle at which light is completely reflected.
15
What happens when the angle of incidence is greater than the critical angle?
Answer
(C)
Total Internal Reflection
16
Which of the following is a characteristic of light rays?
Answer
(B)
They spread out from a source.
17
What is the main purpose of the iris in the eye?
Answer
(B)
To control the amount of light entering the eye.
18
What happens to the speed of light when it moves from water into air?
Answer
(A)
It increases.
19
What is the purpose of an endoscope?
Answer
(B)
To view the inside of the body.
20
What kind of image can a plane mirror produce?
Answer
(D)
Virtual and Upright
21
Which type of surface reflects more light?
Answer
(A)
White surface
22
What are the typical uses of optical fibres?
Answer
A
B
C
23
What type of reflection causes a blurred image?
Answer
(B)
Diffuse Reflection
24
What does a periscope utilize to function?
Answer
(B)
Mirrors or prisms
25
What must occur for total internal reflection to happen?
Answer
(C)
The angle of incidence must be greater than the critical angle.
26
What is the definition of the angle of incidence?
Answer
(C)
The angle between the incident ray and the normal.
27
What happens to the speed of light when it travels through a denser medium?
Answer
(B)
It decreases.
28
What is the name for the point where the incident ray, the reflected ray, and the normal all meet?
Answer
(A)
The point of incidence
29
What describes a non-luminous object?
Answer
(B)
Objects that do not emit light
30
Which of the following can be seen by the human eye?
Answer
A
B
C
31
Which of the following is an example of a medium?
Answer
A
B
32
Which of the following is NOT a typical use for radio waves?
Answer
(C)
Medical imaging
33
What type of waves are radio waves?
Answer
(C)
Transverse waves
34
What type of lens is needed to correct shortsight?
Answer
(C)
Concave lens
35
What is the speed of light in a medium when compared to a vacuum?
Answer
(B)
Slower
36
What is the definition of refractive index?
Answer
(C)
The ratio of the speed of light in vacuum to the speed of light in the medium
37
Which of the following devices can be used to view the inside of the human body?
Answer
(A)
Endoscope
38
What is required for light to be transmitted?
Answer
(B)
A transparent material
39
What is the speed of light in a vacuum (approximately)?
Answer
(A)
300,000 km/s
40
What is the angle of incidence, equal to?
Answer
(A)
The angle of reflection
41
Which type of surface reflects light in a predictable way?
Answer
(D)
A smooth surface
42
What is the role of the lens in a camera?
Answer
(C)
To focus light onto the sensor.
43
What type of lens is used in eyeglasses to correct nearsightedness (myopia)?
Answer
(B)
Concave
44
What happens to the light when the angle of incidence is greater than the critical angle?
Answer
(C)
Total internal reflection
45
What is the role of the pupil in the human eye?
Answer
(C)
To control the amount of light entering.
46
What formula is used to calculate the refractive index of a material?
Answer
(A)
speed of light / speed of light in the medium
47
What is the function of the cornea in the human eye?
Answer
(B)
To focus light onto the retina.