Question 369: Wave Optics

Question

Two coherent sources 'P' and 'Q' produce interference at point 'A' on the screen, where there is a dark band which is formed between 4
th
and 5
th
bright band. Wavelength of light used is 6000 $$\mathop A\limits^o $$. The path difference PA and QA is

Accepted Answer

The dark band between the $$4^{	ext {th }}$$ and $$5^{	ext {th }}$$ bright band in the $$5^{	ext {th }}$$ dark band. For $$5^{	ext {th }}$$ dark band, the path difference is
$$\left(5-\frac{1}{2}ight) \lambda=4.5 \lambda=4.5 	imes 6000=2.7 	imes 10^{-4} \mathrm{~cm}$$

Answer

$$\mathrm{3.6	imes10^{-4}~cm}$$

Answer

$$\mathrm{3.2	imes10^{-4}~cm}$$

Answer

$$\mathrm{2.4	imes10^{-4}~cm}$$

Answer

$$\mathrm{2.7	imes10^{-4}~cm}$$

Wave Optics

Two coherent sources 'P' and 'Q' produce interference at point 'A' on the screen, where there is a dark band which is formed between 4 th and 5 th bright band. Wavelength of light used is 6000 $\mathop A\limits^o $. The path difference PA and QA is

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