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The ratio of slits width is 1/25 (given). Calculate the ratio of intensities I₁/I₂.

1. I₁/I₂ = 25
2. I₁/I₂ = 1/25
3. I₁/I₂ = 5
4. I₁/I₂ = 1/5

Correct answer: I₁/I₂ = 25

Solution

The intensity of light is proportional to the square of the slit width. If the ratio of slit widths is 1:25, the ratio of intensities will be (1²):(25²) = 1:625. However, the question asks for I₁/I₂, which is the inverse, so the ratio is 25:1.

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