Physics for IGCSE & O level - Rays And Waves (Section 3)
1
What are the two types of lens?
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(C)
Convex and Concave
2
What is the angle of refraction when light passes from a medium with a refractive index of 1.0 into a medium with a refractive index of 1.0 at an angle of incidence of 0 degrees?
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(A)
0 degrees
3
What is the name for the bending of light as it passes from one medium to another?
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(B)
Refraction
4
What causes 'short sight' or myopia?
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(B)
The lens focuses the image in front of the retina.
5
What happens to the speed of light when it enters a denser medium?
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(B)
It decreases.
6
What kind of image is formed by the camera?
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(A)
Real and inverted
7
What type of wave is used for satellite communication?
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(B)
Microwaves
8
What is the approximate frequency of yellow light's wavelength?
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(B)
5 x 10^14 Hz
9
What is the definition of a refractive index?
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(B)
The ratio of the speed of light in vacuum to the speed of light in the medium.
10
Which of the following is/are a use of optical fibers?
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A
B
11
In what situation does total internal reflection occur?
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(B)
Light travels from a more dense to a less dense medium at an angle greater than the critical angle.
12
Which type of lens is thinner at the center and thicker at the edges?
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(B)
Concave
13
Which part of the eye detects light and forms an image?
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(B)
Retina
14
What is total internal reflection?
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(A)
When all the light is reflected at the boundary of a medium
15
What happens to the light when it enters a glass prism?
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(B)
It changes direction.
16
Which of the following can cause fluorescence?
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(B)
Ultraviolet light
17
What type of radiation is used in the Remote Controllers?
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(A)
Infrared
18
In short sight, what is the eye's focal length relative to the retina?
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(B)
Too short
19
What is the function of a regenerator in digital communication?
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(B)
To amplify and 'clean up' the digital signal.
20
What is the relationship between wavelength and frequency?
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(C)
They are inversely proportional.
21
What is a key benefit of digital transmission over analogue transmission?
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(B)
Is less susceptible to noise.
22
What happens to the image if an object moves closer to a convex lens?
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(B)
Image moves further from the lens and becomes larger
23
What is the function of the aperture in a camera?
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(B)
To control the amount of light entering the camera
24
Which of these can cause the image on the retina to be distorted?
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A
B
C
25
If the angle of incidence is 30 degrees, what is the angle of reflection?
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(B)
30 degrees
26
What is the speed of light in a medium with a refractive index of 2.0?
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(C)
150,000 km/s
27
What is a characteristic of the image formed by a plane mirror?
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(C)
It is virtual.
28
What part of the human eye is responsible for focusing?
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(B)
Lens
29
In a camera, what is the purpose of the lens diaphragm (aperture)?
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(B)
To control the amount of light
30
What kind of lens is used to correct short-sightedness?
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(B)
Concave
31
Which type of wave is used to cook food in a microwave oven?
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(B)
Microwaves
32
What is the relationship between the speed of light and the refractive index of a medium?
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(B)
Inversely proportional
33
What is the relationship between the angles of incidence and reflection?
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(A)
They are always equal.
34
What type of electromagnetic radiation is used in a microwave oven?
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(B)
Microwaves
35
What are the main dangers associated with X-rays?
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(D)
All of the above.
36
What happens to light rays as they pass through a convex lens?
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(B)
They converge.
37
Which optical component utilizes total internal reflection?
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(D)
Optical Fiber
38
What term describes light bending as it passes from one medium to another?
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(B)
Refraction
39
What is the purpose of the transmission path in a telephone system?
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(B)
To carry the electrical signals over a distance.
40
What is the main purpose of a camera lens?
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(B)
To focus light onto the film or image sensor.
41
What is a main advantage of digital transmission?
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(A)
It reduces noise
42
Which type of radiation is commonly used in medical imaging?
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(C)
X-rays
43
What is the term for the bending of light?
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(B)
Refraction
44
Which of these correctly describes how the speed of light changes as the wavelength increases?
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(C)
It remains the same
45
What happens during dispersion?
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(C)
Light is split into its component colors.
46
What happens to light as it passes from air into water (assuming a non-zero angle of incidence)?
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(B)
It slows down and bends towards the normal.
47
What happens to the speed of light when it enters a denser medium, like glass?
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(B)
It slows down.
48
Which of the following best describes the characteristics of a virtual image?
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(C)
It appears to be located behind the mirror.
49
What is the term for light that spreads until it leaves its source?
