1) A laser has divergence of 1 milli radians . What is the spatial spread for every meter ? The answer is 1 mm . Please explain how the answer is got 2) You are given a light source of coherence length 3 m . It is split into 2 rays such that the path difference between them is 4 m . Can you form a stable interference ? The answer is No . I just want the reasoning to the answer .

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1) A laser has divergence of 1 milli radians . What is the spatial spread for every meter ? The answer is 1 mm . Please explain how the answer is got 2) You are given a light source of coherence length 3 m . It is split into 2 rays such that the path difference between them is 4 m . Can you form a stable interference ? The answer is No . I just want the reasoning to the answer .
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