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Physics for IGCSE & O level - Rays And Waves (Section 6)

1
What type of lens corrects short-sightedness?
Answer
(B)
Concave lens
2
What happens to light that passes through a prism?
Answer
A
B
C
3
What is the main function of the iris?
Answer
(B)
To control the amount of light entering the eye.
4
How does a black surface interact with light?
Answer
(C)
Absorbs most of the light
5
What is Snell's Law?
Answer
(A)
sin i / sin r = refractive index
6
Which part of the eye is a transparent structure that refracts light to help focus it on the retina?
Answer
(A)
Cornea
7
Which part of a simple telephone system converts sound into electrical signals?
Answer
(B)
Microphone
8
Which of the following can be used to measure the wavelength of light?
Answer
A
B
9
What is the relationship between the refractive index and the angle of deviation?
Answer
(D)
Dependent on the medium.
10
What type of signals do optical fibers transmit?
Answer
(C)
Pulses of light
11
Which waves are used for TV broadcasts?
Answer
(A)
VHF and UHF waves
12
What type of waves are used in wireless communications?
Answer
(A)
Radio waves
13
The angle of incidence is equal to?
Answer
(B)
The angle of reflection
14
Which part of the eye refracts light the most?
Answer
(A)
Cornea
15
When light travels from air into glass, which of the following happens?
Answer
(B)
It slows down and bends towards the normal.
16
What type of lens is required for long-sightedness?
Answer
(A)
Convex lens
17
What is the main reason for using optical fibers in telecommunications?
Answer
(C)
They can carry more signals with less attenuation.
18
Which part of the electromagnetic spectrum is used in remote controls?
Answer
(A)
Infrared
19
What is a medium?
Answer
(A)
A transparent material
20
What is the speed of light in a vacuum?
Answer
(A)
300,000 km/s
21
What is the function of the lens in the human eye?
Answer
(B)
To focus light
22
What are the main parts of a simple telephone system?
Answer
(B)
Microphone, Encoder, Transmission path, Decoder, Earphone
23
What determines the color of visible light?
Answer
(B)
Frequency
24
What is the name of the process when light rays bend as they pass from one medium to another?
Answer
(B)
Refraction
25
What is the formula for calculating the refractive index?
Answer
(B)
refractive index = speed of light in vacuum / speed of light in medium
26
What does an encoder do?
Answer
(B)
Converts information into a format for transmission.
27
Which of the following is the best definition of refraction?
Answer
(B)
The bending of light
28
What does a rainbow result from?
Answer
(D)
All of the above
29
Which of the following is a use of RFID technology?
Answer
(B)
To identify goods in shops or libraries
30
What is the angle between the incident ray and the normal called?
Answer
(C)
Angle of incidence
31
What type of signal represents numbers?
Answer
(B)
Digital signal
32
What are the primary components of light?
Answer
B
D
33
What can happen to signals in analog transmission?
Answer
(D)
All of the above
34
Which of these is a property of total internal reflection?
Answer
(B)
Light is totally reflected back into a less dense medium.
35
What is the speed of light in a medium?
Answer
(C)
Always slower than the speed in a vacuum.
36
What is the speed of light in a vacuum?
Answer
(B)
300,000 km/s
37
What type of reflection occurs when light bounces off a rough surface?
Answer
(C)
Diffuse reflection
38
What does the term 'total internal reflection' refer to?
Answer
(C)
Light being reflected back into the same medium.
39
Which of the following components are present within a typical eye?
Answer
A
B
C
D
40
What happens when light is transmitted through a glass?
Answer
(A)
It changes direction.
41
What do we call the process where the eye's lens changes shape to focus on objects at different distances?
Answer
(C)
Accommodation
42
How is light energy produced?
Answer
(B)
Energy used to produce it
43
When light reflects off a surface, what happens to the angle of incidence?
Answer
(A)
It is the same as the angle of reflection.
44
How is the speed of light commonly represented?
Answer
(B)
3 x 10^8 m/s
45
What is an example of a luminous object?
Answer
(C)
The sun
46
What is the effect called when a prism separates white light into colours?
Answer
(C)
Dispersion
47
Which of the following is a characteristic of electromagnetic waves?
Answer
(D)
They consist of oscillating electric and magnetic fields.
48
What property of light is demonstrated by rainbows?
Answer
(B)
Refraction and dispersion
49
What happens to light at the boundary between two media with different refractive indices?
Answer
B
C
50
How does the image appear in a plane mirror compared to the object?
Answer
(B)
Laterally inverted