Question

Practice #3 and shine a laser pointer so that it hits the water-air interface at an incident angle of 52°. Will a friend see the light above the water? Explain. n water 1.33, air1.00 a. yes, because 52o is more than the critical angle from water to air. b. yes, because 52° is less than the critical angle from water to air. c. no, because 520 is more than the critical angle from water to air. d. no, because 520 is less than the critical angle from water to air.

Answer 1

if 0 is the angle of incident light in water beyond which is it totally reflecte d . if you swim in water and shinelaser on water-air boundary with out any light emerging out of liquid critical angle,0 sinsiin ni 1.33 refractiveindex ofincident medium 1.33 for water n,-refractive index of refracting medium-1.0 forair 1.33 с 48.750 so, thefriend will notsee the light,since52° > 48.75° and the light will undergo int ernal reflection hence thechoiceis(c no, because 52° is more than the critical angle from water to air