The brightness ratio in an office is related to brightness of visual task and its surroundings and it should not be

Question

Question: The brightness ratio in an office is related to brightness of visual task and its surroundings and it should not be greater than _____ to avoid eyes discomfort. 

Options:

1.  2 to 1
2.  3 to 1
3.  4 to 1
4.  None of these

Answer 1

2.)  3 to 1

The brightness ratio in an office is related to brightness of visual task and its surroundings and it should not be greater than 3 to 1 to avoid eye's discomfort.

It will hurt eye if the ratio is greater than that of 3:1. This will eventually reduce productivity.