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Problem - The cavity of a Kr+-laser is stimulated to emit at 413.1 nm. If the cavity has a length of 0.75 m calculates:
1) The axial mode number nearest to the line centre.
2) The frequency spacing between axial modes.
3) The maximum length to which the cavity would have to be altered to ensure that only one axial mode could oscillate within the full width half maximum (1.2 GHz) of the 413.1 nm line.
Two 8.0mm×8.0mm electrodes with a0.10-mm-thick sheet of Mylar between them are attached to a 9.0V battery. find the electric field before and after the Mylar is withdrawn
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