What is the minimum thickness of a soap bubble for which the first order of brig

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Question: What is the minimum thickness of a soap bubble for which the first order of bright fringe appears for light of wavelength 550 nm?

Options:

Correct Answer: 275 nm

Solution:

For the first order bright fringe, thickness t = λ/2 = 550 nm / 2 = 275 nm.

What is the minimum thickness of a soap bubble for which the first order of bright fringe appears for light of wavelength 550 nm?

What is the minimum thickness of a soap bubble for which the first order of bright fringe appears for light of wavelength 550 nm?

Step 1: Understand that a soap bubble creates interference patterns when light reflects off its surfaces.
Step 2: Know that the first order bright fringe occurs when the path difference between the light waves reflecting off the top and bottom surfaces of the bubble is equal to one wavelength.
Step 3: The formula for the thickness (t) of the soap bubble for the first order bright fringe is t = λ/2, where λ is the wavelength of the light.
Step 4: Given the wavelength of light is 550 nm, substitute this value into the formula: t = 550 nm / 2.
Step 5: Calculate the thickness: 550 nm divided by 2 equals 275 nm.
Step 6: Conclude that the minimum thickness of the soap bubble for the first order bright fringe is 275 nm.

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