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