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