MCQOPTIONS
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MCQOPTIONS
| 1. |
A light of wavelength\[5890\,\,{AA}\]falls normally on a thin air film. The minimum thickness of the film such that the film appears dark in reflected light [Pb. PMT 2003] |
| A. | \[2.945\times {{10}^{-7}}m\] |
| B. | \[3.945\times {{10}^{-7}}m\] |
| C. | \[4.95\times {{10}^{-7}}m\] |
| D. | \[1.945\times {{10}^{-7}}m\] |
| Answer» B. \[3.945\times {{10}^{-7}}m\] | |