Answer:
One way to exactly double the illuminance on an object is to increase the light intensity by a factor of four (quadruple the light intensity).
Explanation:
This is based on the inverse square law of light, which states that illuminance decreases with the square of the distance from the source. Therefore, to double the illuminance, you need to reduce the distance from the light source by half, which quadruples the light intensity.
Here's an example:
Let's say you have a light source that currently provides an illuminance of 500 lux on an object at a certain distance. To exactly double the illuminance to 1000 lux on the same object, you would need to increase the light intensity by a factor of four.
Using the inverse square law, if the current distance from the light source to the object is 2 meters, to double the illuminance, you'd need to reduce that distance by half, which would be 1 meter.
Now, at the new distance of 1 meter, the illuminance would be increased by a factor of four. So, if the light intensity remains the same, the illuminance would become:
500 lux * 4 = 2000 lux
Therefore, by reducing the distance from the light source to the object from 2 meters to 1 meter, you have exactly doubled the illuminance from 500 lux to 2000 lux on the object.
Answer:
Increasing the light intensity by a factor of 2 or using a mirror to reflect the light can exactly double the illuminance on an object
Explanation:
1 Increase the light intensity by a factor of 2
2 Use a mirror to reflect the light onto the object
