Question

00 In an optics lesson, a Physics student traces the paths of the ray of light near the boundary between transparent medium A and air. The student uses a protractor to measure the angles. Air x = 30° y = 48 medium A (a) Which medium is optically dense, and how you can tell this. (b) Calculate the refractive index of medium A. (1 mark) (2 marks)

Answer 1

Ans. Given that se = 30 Air y = 48° medium A n (a) - medium A is optically deme -> because it in a medium the light of speed is less and the eray bends toward the normal than the medilem is optically desse. here the ray in Air going away from the Normal so Air is rarer medium and medium A is dense -> Refractive inden of medium A from snell's law n, sina= n,siny =) for air N = 1} = n, sin (30)= 1xsin (489) sim148°) sin (30) ni าา 0-7437 0.5 n, 1.4862 medium est A

it ongle a in medium A is increased and finds that the light does not pass in to the ain at some ongle. Because of T.I.R T.I.RC Total Internal Reflection ) :-> -> when a ray of light goes to dense medium to rare medium then it goes away forom the Normal if the incident ongle is increase at cutical ongle where the reflected ongle is goº ond ray goes along the surface, in this condition incident ongle is called critical ongle (ec) when incident ongle is increase more from critical ongle oc the reflected hay of light complete reflection within the medium this effect is called Total Internal Reflection . Now find the maximum value of ongle de : > in the critical ongle condition the marimum value of onglere possible for which light pass out of the block into air. from snell's law 12, sinne กา, Sกาย 1x singo 2. 1-4862 X Site - ราทน - 1 1.4862 แ56 - 42.28 => marimum value of ae
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