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If my aircraft has luminance of 10 unit and is designed to operate in background which has luminance of 8 unit then, what will be the approximate value of contrast?

If my aircraft has luminance of 10 unit and is designed to operate in background which has luminance of 8 unit then, what will be the approximate value of contrast? Correct Answer 0.25 unit

Given, luminance of A/C L1=10unit, luminance of background L2 = 8unit. Approximate contras value C = |L1-L2|/L2 = |10-8|/8 = 2/8 = 0.25 unit.

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