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In Figure, a light wave along ray r_(1) reflects once from a mirror and a light wave along ray r_(2) reflects twice from that same mirror and once from a tiny mirror at distance L from the bigger mirror. (Neglect the slight tilt of the rays.) The waves have wavelength lambda and are initially exactly out of phase. What are the (a) smallest. (b) second smallest, and (c) fourth smallest values of L // lambda that result in the final waves being exactly in phase? |
| Answer» SOLUTION :(a) 0.25, (B) 0.75, (C) 1.25 | |