In a thin film of oil on water, which color will appear bright if the film thickness is such that destructive interference occurs for blue light?

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Q: In a thin film of oil on water, which color will appear bright if the film thickness is such that destructive interference occurs for blue light?

Solution: If destructive interference occurs for blue light, the complementary color (red) will appear bright.

Steps: 5

Step 1: Understand that a thin film of oil on water can create different colors due to interference of light.
Step 2: Know that interference can be constructive (colors appear bright) or destructive (colors appear dim).
Step 3: Identify that if destructive interference occurs for blue light, it means blue light is canceled out.
Step 4: Remember that colors are complementary; the complementary color of blue is red.
Step 5: Conclude that if blue light is canceled out, the color that will appear bright is red.