74. A narrow beam of monochromatic light is incident normally on a diffraction grating. Third-order diffracted beams are formed at angles of 45° to the original direction. What is the highest order of diffracted beam produced by this grating? A. 3rd B. 4th C. 5th D. 6th
74. A narrow beam of monochromatic light is incident normally on a diffraction grating. Third-order diffracted beams are formed at angles of 45° to the original direction. What is the highest order of diffracted beam produced by this grating? A. 3rd B. 4th C. 5th D. 6th
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