Question: The distance between a light source and surface A in 2m and the distance between the same light source and surface B is 20m. What

The distance between a light source and surface A in 2m and the distance between the same light source and surface B is 20m. What is the ratio of illuminance on surface B to illuminance on surface A?

Options:

1. 100

2. 10

3. 1

4. 0.1

5. 0.01

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