Discussion
Which of the following materials has highest spectacular reflection coefficient at an angle of 45° of incidence over it ?
Answer: D
The highest specular reflection coefficient is that of silver.
Silver reflects about 95 per cent or more of visible light across the spectrum, the highest of common materials, which is why it is used for mirrors. Gold also reflects strongly, but less in the blue and green, which gives it its colour.
Water and glass are dielectrics: at 45 degrees of incidence they reflect only a few per cent of the light and transmit the rest.
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