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    Hi. I just wanted to ask a quick question in regards to c i) and d parts.
    For c i) , I worked it out to be 8/3 mm from O to B ( O to A would be {4 mm / 3} * 2) but in the mark scheme, it says 2mm. Could you tell me where I going wrong or is there an error in the mark scheme?
    For d), wouldn't the path difference be, at A, 1.5lambda because of 2nd order minima as oppose to 2lambda which is what is stated in the mark scheme.
    Thank You.

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    I think the diagram in the question is wrong. The original question is shown below.
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    You are awesome.
    Thank You.


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Updated: April 25, 2016
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