Two point sources in a ripple tank vibrate in phase at a frequency of 12 Hz to produce waves of wavelength 0.024 m. The difference in path length from the two point sources to a point on the 2nd nodal line is: a) 12 cm b) 0 cm c) 4.8 cm d) 3.6 cm e) 24 cm f) 3.4 cm g) 1.2 cm h) 0.60 cm

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.