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Resultant intensity of two interfering waves with a given phase difference

This type of question, asked 2 times: 11 May 2023 S1, 11 May 2023 S2. All 2 questions below, oldest first.

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  1. Question 1

    11 May 2023 S1

    18
    Two identical light waves having phase difference ϕ\phi propagate in same direction. When they superpose, the intensity of resultant wave is proportional to

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  2. Question 2

    11 May 2023 S2

    13
    Considering interference between two sources of intensities 'I' and '4I', the intensity at a point where the phase difference is π\pi is (cos⁡π=−1)(\cos\pi = -1)

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