The wavelengths of red, green, and blue light are shown in the table. Color Wavelength (nm) red 620–780 green 490–570 blue 440–490   Which statement correctly compares the frequency and energy of two different colors of light? A Red light has a lower frequency and more energy than green light.   B Red light has a greater frequency and less energy than green light.   C Green light has a lower frequency and less energy than blue light.   D Green light has a greater frequency and more energy than blue light.

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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.