Welcome to the Quiz!
This quiz contains 15 questions from a mix of 1 subtopics.
Which of the following best describes plane polarised waves?
waves that vibrate in a single plane perpendicular to their direction of travel
waves that vibrate in multiple perpendicular planes
waves that vibrate in spiral patterns
waves that only vibrate parallel to their direction of travel
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What type of waves can be plane polarised?
both longitudinal and transverse waves
longitudinal waves
neither longitudinal nor transverse waves
transverse waves
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In an experiment with two crossed polarising filters rotated relative to each other, at what orientation is light transmission blocked completely?
90°
180°
45°
0°
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What happens when unpolarised light passes through a polarising filter?
it becomes plane polarised
it becomes circularly polarised
it becomes longitudinally polarised
it becomes randomly polarised
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Malus's law gives the transmitted intensity (I) of polarised light after an analyser in terms of:
incident intensity and wavelength
incident intensity and refractive index
incident intensity (I0) and angle between the transmission axes (θ)
incident intensity and speed
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What happens to the transmitted intensity when plane polarised light is incident at 90° to the transmission axis of an analyser?
half the original intensity is transmitted
the intensity doubles
no light is transmitted
the full intensity is transmitted
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In Malus's law, the angle θ refers to:
the angle between the incident polariser and emergent analyser transmission axes
the angle between the polarised light and the transmission axis of the analyser surface
the angle between the polarised light and the normal to the surface
the angle between the polarised light and the direction of propagation
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What type of waves require different techniques compared to light for achieving polarisation?
radio waves
infrared waves
microwaves
X-rays
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How does a metal grille polarise microwaves?
by reflecting the microwaves
by refracting the microwaves
by diffraction from the wires
by selectively absorbing microwaves parallel to the wires
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What law relates transmitted intensity to angle for a polariser-analyser system?
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How can light polarisation be investigated using filters?
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Polarised light with an initial intensity of 50 W m-2 is incident on a polariser at an angle of 60°. Calculate the transmitted intensity of the light.
12.5 W m-2
25 W m-2
43.75 W m-2
37.5 W m-2
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An unpolarised light beam with an intensity of 120 W m-2 is incident on a polariser. What is the intensity of the light after it passes through the polariser?
60 W m^-2
90 W m^-2
120 W m^-2
30 W m^-2
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Calculate the intensity of polarised light after passing through a polariser if the light is incident at an angle of 45° to the polariser's transmission axis, given the initial intensity is 40 W m-2.
30 W m-2
28.28 W m-2
40 W m-2
20 W m-2
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What is the transmitted intensity of light if unpolarised light of intensity 80 W m-2 is incident on two polarisers, the first polariser being aligned with the incident light and the second at 60° to the first?
40 W m-2
10 W m-2
30 W m-2
20 W m-2
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