YR 11 PHYSICS - UNIT 1
LIGHT TEST (2)
NAME: ............................................................
Answer all questions in the spaces provided unless instructed to use graph paper. Marks are as
indicated. Circle the correct response: True or False and Multiple Choice. (Take nair = 1.0)
1.
The three primary physics colours are .................., ....................... and ........................... (1 mark)
2.
Which of the following statements is most correct (1 mark)?
A. A pure red filter absorbs red light and reflects all other colours.
B. A pure red filter reflects red light and absorbs all other colours.
C. A pure red filter transmits red light and reflects all other colours.
D. A pure red filter transmits red light and absorbs all other colours.
3.
Complementary colours combine together to produce white light. ....................................... is the
complementary colour of green (1 mark).
4.
Explain why a pure yellow object looks yellow under white light (2 marks). ................................................
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What would it look like under pure blue light? Explain why. (1 mark) ..............................................................
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5.
The refraction of light as it passes from one medium into another is caused by (1 mark)
A. frequency change
B. the bending of light
C. a speed change
D. diffraction
6.
Light bends ............................... the normal when it travels from air to glass (1 mark).
7.
Light is incident at an angle of incidence of 53 at an air/water boundary. The absolute
refractive index of water is 1.3. Find the angle of refraction in water. (1 mark)
0
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8.
When light refracts from one transparent medium into another the speed remains constant.
T or F (1 mark)
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YR 11 PHYSICS - UNIT 1
9.
On the diagram below mark in the normal, the general path of the refracted ray, the angle of
incidence and the angle of refraction. (2 marks)
glass
air
10.
What is the relative refractive index of light passing from water into flint glass if the angle
o
o
of incidence is 33.0 and it refracts at an angle of 26.3 ? (1 mark)
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11.
Explain with the aid of an appropriate diagram why someone standing in a pool filled with water
has legs that look smaller than normal if they are viewed by someone looking from the side of
the pool. (3 marks)
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YR 11 PHYSICS - UNIT 1
12.
Which of the statements is incorrect - TIR stands for Total Internal Reflection (1 mark)?
o
A. The angle of refraction is 90 at the critical angle of incidence.
B. TIR can not occur when light is passing from air into water.
C. TIR can not occur when light is passing from glass into air
D. TIR can only occur when light is attempting to pass from a more dense medium into a less
dense one.
13.
Find the critical angle for light passing from oleic acid (no = 1.45) into air. (1 mark)
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14.
A girl uses a convex lens of focal length 25cm as a magnifying glass. She positions the lens so
that the object (some writing) is 15 cm from the lens. The image will be: (1 mark)
A. Real, inverted, magnified
B. Virtual, inverted, magnified
C. Real, upright, magnified
D. Virtual, upright, magnified
E. Virtual, upright, diminished
15.
Use graph paper to construct a scale diagram to determine the position, nature and
magnification of an 3.0 cm object placed 25 cm from a convex lens of focal length 15 cm (3
marks).
16.
Use the lens formula to find the position, nature and magnification of an object 5.0 cm high
placed 15 cm from a convex lens of focal length 30 cm. (3 marks)
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17.
Use the lens formula to find the position, nature and magnification of an object 5.0 cm high
placed 40 cm from a concave lens of focal length 20 cm. (3 marks)
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