A) \[200\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[2000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[1000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) infinity
Correct Answer: B
Solution :
For minimum in reflected light \[2\mu t\cos r=n\lambda \] \[t=\frac{n\lambda }{2\mu \cos \,\,r}\] \[{{t}_{\min }}=\frac{\lambda }{2\mu }=\frac{6000\,\overset{\text{o}}{\mathop{\text{A}}}\,}{2\times 1.14}\] \[=2142\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\approx 2000\overset{\text{o}}{\mathop{\text{A}}}\,\]
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