A point situated at $6.5$ cm and $6.65$ cm from two coherent sources. Find the nature of illumination at the point if wavelength of light is $5000$ $o A$ .

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Solution

Path difference $= 0.15 c m = 15 \times 10^{- 4} m$

Wavelength $= 5000 A = 5 \times 10^{- 7} m$

If path difference = n $\times$ wavelength , then it will be a point of constructive interference where n is Natural number.

Here , the $n = \frac{(15 \times 10^{- 4})}{(5 \times 10^{- 7})} = 3000$ is natural number

Hence the point will undergo constructive interference and will be bright.

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A point situated at 6.5 cm and 6.65cm from two coherent sources. Find the nature of illumination at the point if wavelength of light is 5000 oA.

A point situated at $6.5$ cm and $6.65$ cm from two coherent sources. Find the nature of illumination at the point if wavelength of light is $5000$ $o A$ .