In Young's double-slit experiment, monochromatic light of wavelength 630 nm illuminates the pair of slits prodcues an interference pattern in which two consecutive bright fringes are separated by 8.1 mm. Another source of monochromatic light produces the interference pattern in which the two consecutive bright fringes are separated by 7.2 mm. Find the wavelength of light for the second source.
What is the effect on the interference fringes if the monochromatic source is replaced by a source of white light?

Explanation

To solve the problem, we will use the formula for fringe width in Young's double-slit experiment, which is given by:

\[ \beta = \frac{\lambda D}{d} \]

where:
- \(\beta\) is the fringe width,
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