In a thin film of oil on water, if the thickness of the film is 200 nm, what is

In a thin film of oil on water, if the thickness of the film is 200 nm, what is the condition for the first order bright fringe?

In a thin film of oil on water, if the thickness of the film is 200 nm, what is the condition for the first order bright fringe?

Step 1: Understand that we are dealing with a thin film of oil on water.
Step 2: Know that the thickness of the oil film is given as 200 nm.
Step 3: Recognize that we want to find the condition for the first order bright fringe.
Step 4: Remember the formula for constructive interference in a thin film: 2t = mλ.
Step 5: Identify that 't' is the thickness of the film (200 nm) and 'm' is an integer representing the order of the fringe.
Step 6: For the first order bright fringe, set m = 1.
Step 7: Substitute the values into the formula: 2(200 nm) = 1λ.
Step 8: Simplify the equation to find λ: λ = 400 nm.

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