Questions
A point source of light is placed 4 m below the surface of water of refractive index . The minimum diameter of a disc which should be placed over the source on the surface of water to cut–off all light coming out of water is
detailed solution
Correct option is B
Here sini=1μ=35 and hence tani=34=r4 This gives r=3m, hence diameter =6mTalk to our academic expert!
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A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is and the fish is 12 cm below the surface, the radius of this circle in cm is
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