Two point sources produce waves of the same wavelength that are in phase. at a point midway between the sources, what kind of interference would be observed?

Constructive interference.

Explanation:

If the path difference between the two wave is,

Then this type of interference is constructive.

Here, is the wavelength and

According to the question, the two waves are in same phase  and in the midway the two sources are at equal distances the wave interfere and the path difference between them is zero.

Therefore, the interfere constructively.

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