A periscope for a submarine uses twototally reflecting 45-45-90 degree prism wit

Question

A periscope for a submarine uses twototally reflecting 45-45-90 degree prism with total internalreflection on the sides adjacent to the 45-degree angles. Whathappens if the bottom prism is covered with water?
Layer of waterwill work as a lens and periscope will show objects farther thanthey are
Layer of waterwill work as a lens and periscope will show objects closer thanthey are
Periscope willnot work as critical angle on the glass-water boundary will begreater than 45 degrees and total internal reflection will notoccur
Periscope willwork as usually

Explanation / Answer

A periscope for asubmarine uses two totally reflecting 45-45-90 degree prism withtotal internal reflection on the sides adjacent to the 45-degreeangles. What happens if the bottom prism is covered withwater , (1)Layer of water will workas a lens and periscope will show objects farther than theyare . Hope this helps u!

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