A) \[4800\,\overset{\text{o}}{\mathop{\text{A}}}\,\] and \[5200\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[4800\,\overset{\text{o}}{\mathop{\text{A}}}\,\]and \[6700\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) only
D) \[5200\,\overset{\text{o}}{\mathop{\text{A}}}\,\] only
Correct Answer: C
Solution :
for intensified reflected beam |
\[2\mu t=(2n-1)\frac{\lambda }{2};n=1,2,...\] |
Or \[\lambda =\frac{4\mu t}{(2n-1)}=\frac{4\times 1.5\times 0.40\times {{10}^{-6}}}{(2n-1)}\] |
\[=\frac{2.4\times {{10}^{-6}}}{(2n-1)}\] |
For \[n=3,\] |
\[\lambda =4800\,\overset{\text{o}}{\mathop{\text{A}}}\,\] (only wavelength between \[4000\,\overset{\text{o}}{\mathop{\text{A}}}\,\] to \[7000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]) |
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