Malus's Law and Light Intensity

The video tutorial by Professor Sassani explains Malus Law, which describes the intensity of light passing through polarizers. The tutorial covers the theory, apparatus, and experimental setup to verify Malus Law. It demonstrates how to measure light intensity changes as the angle between polarizers varies, using a photocell and ammeter. The video guides viewers through data collection, graphing, and analysis, concluding that the intensity is proportional to the cosine square of the angle between polarizers.

What happens to the intensity of light when the angle between the polarizer and analyzer is 90 degrees?

• The intensity is maximum.

• The intensity is zero.

• The intensity is unchanged.

• The intensity is doubled.

According to Malus's Law, what is the relationship between the intensity of light and the angle between the polarizer and analyzer?

• Intensity is inversely proportional to the angle.

• Intensity is directly proportional to the cosine square of the angle.

• Intensity is independent of the angle.

• Intensity is directly proportional to the sine of the angle.

What is the purpose of the photocell in the experimental setup?

• To measure the angle between polarizer and analyzer.

• To supply power to the setup.

• To record the variation in light intensity.

• To stabilize the light source.

Which device is used as an ammeter in the experimental setup?

• A rheostat.

• A galvanometer.

• A voltmeter.

• A digital multimeter set as an ammeter.

What is the first step in making connections for the experiment?

• Connect the lamp to the power supply.

• Connect the photocell to the analyzer.

• Connect the positive of the power supply to the positive of the ammeter.

• Connect the negative of the power supply to the ammeter.

How is the current measured in the experiment?

• By using a galvanometer.

• By using a voltmeter.

• By using a digital multimeter set to measure current.

• By using a digital multimeter set to measure voltage.

What is plotted on the x-axis of the graph in the experiment?

• Cosine square of the angle

• Intensity

• Current

• Cosine of the angle

What does a straight line on the graph indicate in the context of Malus's Law?

• Intensity is directly proportional to cosine square theta.

• Intensity is inversely proportional to cosine square theta.

• Intensity is directly proportional to sine square theta.

• Intensity is independent of cosine square theta.

What is the relationship between current and intensity in the experiment?

• Current is directly proportional to intensity.

• Current is inversely proportional to intensity.

• Current is independent of intensity.

• Current is directly proportional to the square of intensity.

What conclusion can be drawn from the experiment regarding Malus's Law?

• Malus's Law is disproved.

• Malus's Law is verified.

• Malus's Law is irrelevant.

• Malus's Law is partially true.