Question: Total internal reflection is applied in the periscope of a submarine to let the user see around corners. In this device, two prisms are arranged

Total internal reflection is applied in the periscope of a submarine to let the user €œsee around corners.€ In this device, two prisms are arranged as shown in Figure Q35.17, so that an incident beam of light follows the path shown. Parallel tilted silvered mirrors could be used, but glass prisms with no silvered surfaces give higher light throughput. Propose a reason for the higher efficiency.

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