What is the minimum thickness of a soap film that appears dark when viewed in re

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Question: What is the minimum thickness of a soap film that appears dark when viewed in reflected light?

Options:

Correct Answer: λ/2

Solution:

For destructive interference in reflected light, the minimum thickness of the film must be λ/2.

What is the minimum thickness of a soap film that appears dark when viewed in reflected light?

What is the minimum thickness of a soap film that appears dark when viewed in reflected light?

Correct Answer: λ/2

Step 1: Understand that a soap film can reflect light.
Step 2: Know that light can interfere with itself when it reflects off surfaces.
Step 3: Learn about destructive interference, which happens when light waves cancel each other out.
Step 4: Realize that for destructive interference to occur in reflected light, the thickness of the soap film must be a specific value.
Step 5: Remember that the minimum thickness for this destructive interference is half the wavelength of the light (λ/2).
Step 6: Conclude that if the soap film is this thickness, it will appear dark when viewed in reflected light.

No concepts available.