KCET · Physics · Wave Optics
If the two slits in Young's double slit experiment are of unequal width, then
- A the dark fringes are not perfectly dark
- B the bright fringes will have unequal spacing
- C the bright fringes will have unequal brightness
- D the fringes do not appear
Answer & Solution
Correct Answer
(A) the dark fringes are not perfectly dark
Step-by-step Solution
Detailed explanation
If \(I_{1} \neq I_{2}\), then minimum energy of the interference pattern,
\(I_{\min }=\left(\sqrt{I_{1}}-\sqrt{I_{2}}\right)^{2}\) is not zero.
Hence, dark fringes are not perfectly dark.
\(I_{\min }=\left(\sqrt{I_{1}}-\sqrt{I_{2}}\right)^{2}\) is not zero.
Hence, dark fringes are not perfectly dark.
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