WorksheetsF4 Chapter 5 LIGHT (I)
Total questions: 20
Worksheet time: 20mins
What is the phenomenon when we see our image on a surface?
Refraction of light
Reflection of light
Total internal reflection
Interference of light
In Diagram I, there are 10 alphabets in the word REFLECTION on a card. How many alphabets are identical to the original alphabets when the card is facing the mirror?
2
3
4
5
Diagram 2 shows a light ray incidents onto a plane mirror. Calculate the angle of refraction.
38 °
52 °
128 °
142 °
An object is placed 5 m in front of a plane mirror. What happen to the size of the object when it is moved 2 m closer to the mirror?
Bigger
Smaller
Same
An object is placed 15 cm from a concave mirror of focal length 6 cm. Which characteristic of the image formed is true?
Virtual
Diminished
Upright
Image formed at F
A light ray from an Object, O incidents onto a concave mirror. The incident ray passing through the centre of curvature, C as shown in Diagram 3. F is the focal point of the curvature. The reflected ray will...
be parallel to the principle axis.
pass through the focal point in front of the mirror.
travel along the original path of the incident ray.
Refraction of light occurs when...
light ray hits a surface and bounces back.
light ray changes its direction when it travels from a medium into another medium of different densities.
light ray passes through a very small gap.
Diagram 4 shows two identical prisms, ABC and KLM. If the rays DE and PQ are parallel with the sides BC and LM respectively, calculate the value of θ .
24.2 °
28.6 °
35.8 °
37.9 °
Diagram 5 shows the propagation of a light ray from air into liquid X. What is the refractive index of liquid X?
0.50
0.59
1.71
2.01
When a light ray is incident into a glass block at 400 to normal, it gives an angle of refraction of 270. What is the speed of light in the glass block?
[Speed of light in air = 3.0 x 108 m s-1]
2.12 x 108 m s-1
2.35 x 108 m s-1
4.25 x 108 m s-1
4.72 x 108 m s-1
Diagram 6 shows the propagation of a light ray from air into water. The refractive index of water can be calculated using the formula
sin rsin p
sin ssin p
sin rsin q
sin ssin q
Which optical instrument applies the principle of total internal reflection of light?
A compound microscope
Prisms in a periscope
An astronomical telescope
A slide projector
Diagram 7 shows a light ray travelling from air into a glass prism. What is the critical angle of the glass?
43 °
47 °
68 °
69 °
Calculate the refractive index of a liquid with a critical angle of 48 ° .
0.74
1.11
1.35
1.49
One example of natural phenomenon that involves total internal reflection is...
a straight object looks bent in water.
a boy is able to see his image in a plane mirror.
the formation of mirage.
the depth of a swimming pool looks shallower than it really is.
The focal length of a concave lens is 20 cm. What is the power of the lens?
+5 D
-5 D
+0.05 D
-0.05 D
Diagram 8 shows the image formation of an object by a convex lens. Calculate the focal length of the convex lens.
4.8 cm
15.7 cm
12.0 cm
13.3 cm
Refer to the information given for questions 18.
If the lenses are used in an astronomical telescope for normal usage, what is the distance between the two lenses?
4.0 cm
46.0 cm
50.0 cm
54.0 cm
Refer to the information given for questions 19.
What is the magnification of the telescope?
2
8
12.5
25
An object is placed in front of a convex lens with power of 2.5 D. The size of the image is four times the size of its object. Calculate the distance between the object and image.
40 cm
50 cm
150 cm
250 cm
