A) \[8\text{ }:\text{ }1\]
B) \[3\text{ }:\text{ }1\]
C) \[81\text{ }:\text{ }1\]
D) \[9\text{ }:\text{ }1\]
Correct Answer: C
Solution :
\[Intensity\text{ }of\text{ }direct\text{ }ray=\,\,{{I}_{0}}\,\,=\,\,kA_{0}^{2}\] Intensity of reflected ray \[=\frac{64}{100}{{I}_{0}}\,=\,\,k{{\left( \frac{8{{A}_{0}}}{10} \right)}^{2}}\] \[\therefore \,\,\frac{{{\operatorname{I}}_{max}}}{{{\operatorname{I}}_{min}}}\,\,=\,\frac{{{({{A}_{0}}+0.8{{A}_{0}})}^{2}}}{{{({{A}_{0}}-0.8{{A}_{0}})}^{2}}}={{\left( \frac{1.8}{0.2} \right)}^{2}}=\frac{81}{1}\]?
You need to login to perform this action.
You will be redirected in
3 sec
