Question : Which apparatus is used to measure the intensity of light?
Option 1: Lux Meter
Option 2: Calorimeter
Option 3: Anemometer
Option 4: Altimeter
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Correct Answer: Lux Meter
Solution : The answer is Lux meter .
A lux Meter operates by detecting light—the perceived intensity of brightness to the human eye. It accomplishes this by utilising a photosensitive cell. In the International System of Units (SI), the lux serves as the standard unit for illuminance, quantified in lumens per square metre (lm/m 2 ).
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