A) 1.2 cm
B) 1.2 cm
C) 2.4 cm
D) 2.4 cm
Correct Answer: D
Solution :
From the figure, \[\tan \theta =\frac{x/2}{2}\] |
For small \[\theta \] and when \[\theta \] is counted in rad, \[\tan \simeq \theta \] |
So, \[\theta \simeq \frac{x/2}{2}\Rightarrow \frac{\lambda }{9}\simeq \frac{x}{4}\] |
\[x\simeq \frac{4\lambda }{a}\simeq \frac{4\times 600\times {{10}^{-9}}}{{{10}^{-3}}}m\] |
\[\simeq 24\times {{10}^{-4}}m\] |
\[\simeq 2.4\times {{10}^{-3}}m\] |
\[\simeq 2.4\,mm\] |
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