Question

explain it pls...teacher​

Answer 1

Answer:

sin30°/1.5=1/3

Explanation:

let angle of refractor=r

angle of incidence(i)= 30°

By Snell's law,

      sin i/sin r= refractive index of glass/refractive index of air

Sin 30°/ Sin r=1.5

=sin r⇒ Sin 30°/1.5=1/3

Hence,1/3

Answer 2

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Modern submarines are usually cigar-shaped. ... It is structurally efficient for withstanding external pressure, and significantly reduces the hydrodynamic drag on the sub when submerged, but decreases the sea-keeping capabilities and increases drag while surfaced.