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Question
What is meant by Constructive interference?
Solution
When the path difference P = nλ or phase difference Φ = 2nπ, the two waves re in the same phase and so they create a bright fringe of maximum intensity. This phenomenon is called constructive interference.
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A long narrow horizontal slit is paced 1 mm above a horizontal plane mirror. The interference between the light coming directly from the slit and that after reflection is seen on a screen 1.0 m away from the slit. If the mirror reflects only 64% of the light energy falling on it, what will be the ratio of the maximum to the minimum intensity in the interference pattern observed on the screen?
Answer in brief:
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