MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
| 1. |
A slit of width\[a\]is illuminated by white light. For red light\[(\lambda =6500\,\,{AA})\], the first minima is obtained at\[\theta ={{30}^{o}}.\] Then the value of a will be [MP PMT 1987; CPMT 2002] |
| A. | \[3250\,\,{AA}\] |
| B. | \[6.5\times {{10}^{-4}}mm\] |
| C. | 1.24 microns |
| D. | \[2.6\times {{10}^{-4}}cm\] |
| Answer» D. \[2.6\times {{10}^{-4}}cm\] | |