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Physics for IGCSE & O level - Rays And Waves (Section 7)

1
What happens to the light that is reflected by a black surface?
Answer
(C)
Very little light is reflected.
2
What type of lens is used to correct long-sightedness?
Answer
(B)
Convex
3
How is short sight corrected?
Answer
(A)
With a concave lens.
4
Which of the following is a characteristic of short sight?
Answer
(A)
Difficulty seeing distant objects clearly.
5
What is the cause of dispersion of light?
Answer
(B)
Refraction
6
What happens to light when it encounters a transparent material?
Answer
(B)
It is transmitted through
7
Which of the following is necessary to produce light?
Answer
(A)
Energy
8
What is the relationship between the energy and the frequency of an electromagnetic wave?
Answer
(C)
They are directly proportional.
9
Which colours are formed when white light is passed through a prism?
Answer
A
B
C
10
What type of electromagnetic radiation has the shortest wavelength?
Answer
(C)
X-rays
11
What does 'laterally inverted' mean in reference to a plane mirror image?
Answer
(B)
The image is reversed left to right.
12
Which of these is an example of a luminous object?
Answer
(B)
The Sun
13
Which of the following is a property of light?
Answer
(B)
It travels in straight lines.
14
What is the term for the angle at which light refracts at 90 degrees?
Answer
(C)
Critical Angle
15
Which waves have the shortest wavelengths and highest frequencies?
Answer
(C)
Gamma rays
16
What determines the refractive index of a material?
Answer
(B)
The speed of light in a vacuum and the speed of light in the material.
17
Which type of lens is thicker in the middle and thinner around the edges?
Answer
(B)
Convex lens
18
What does a prism do to white light?
Answer
(B)
Refracts it
19
What is the unit of the speed of light?
Answer
(D)
km per second
20
What do the short wavelengths of X-rays allow?
Answer
(A)
The to penetrate through bones.
21
Where is the image formed in a plane mirror?
Answer
(B)
Behind the mirror
22
Which factor does the value of critical angle depend on?
Answer
(B)
Material
23
What is the key feature in which light travels?
Answer
(C)
Straight lines
24
What happens to light when it is internally reflected?
Answer
(D)
It bounces back into the original medium.
25
What is meant by 'monochromatic' light?
Answer
(B)
Light with one colour or wavelength
26
What is meant by the term 'medium' in relation to light?
Answer
(B)
The pathway light travels through.
27
What is an object called that doesn't emit light?
Answer
(B)
Non-luminous
28
Which type of electromagnetic radiation is used in satellite communications?
Answer
(A)
Microwaves
29
What is the main advantage of using digital signals?
Answer
(B)
They are less susceptible to noise.
30
What is light energy needed to do?
Answer
(B)
Produce light
31
What are the main components of light
Answer
A
B
32
Why do objects appear to have different colours?
Answer
(B)
Because they reflect different wavelengths of light.
33
What advantages do digital signals have over analog signals?
Answer
(D)
All of the above
34
What type of image is always produced in the human eye?
Answer
(C)
Real and inverted
35
Which of the following can correct short sight?
Answer
(B)
Concave lens
36
Which of these is a common use of convex lenses?
Answer
(B)
Correcting farsightedness
37
Which part of the eye is responsible for focusing light onto the retina?
Answer
(D)
Lens
38
What does 'non-luminous' mean?
Answer
(C)
Not emitting light
39
What does the term 'refraction' of light mean?
Answer
(A)
Bending of light
40
What type of reflection occurs with a smooth surface?
Answer
(B)
Regular reflection
41
Which of these forms of electromagnetic radiation can be used to sterilize medical equipment?
Answer
(B)
Gamma rays
42
In Snell's Law, what is the relationship between the angle of incidence and the angle of refraction?
Answer
A
D
43
What type of image does a diverging lens always produce?
Answer
(D)
Virtual and upright
44
Which type of image is formed behind the mirror?
Answer
(B)
Virtual image
45
What phenomenon explains why the speed of light is different in different mediums?
Answer
(B)
Refraction
46
How does a convex lens magnify an object?
Answer
(C)
By bending light rays to create a larger image on the retina.
47
In a converging lens, where do rays that are parallel to the principal axis converge?
Answer
(B)
The focal point
48
Which is an example of a device that uses wireless technology?
Answer
(D)
All of the above.
49
What is the role of a mirror?
Answer
A
B
50
What is a laser diode used for?
Answer
(B)
Emitting light in optical fibres.