angle in this case, the angle of 12. Light is entering water (n2 4/3) from glass

Question

angle in this case, the angle of 12. Light is entering water (n2 4/3) from glass (ni 3/2). What is the Brewster's incidence in glass, where the angle of refraction in water is perpendicular to the angle of reflection in glass? B) 48°, 1.33 C) 52 D) 63 E) 90 Hint: Law of reflection: Oreflection 0incidence 13. Light is entering glass (n2 3/2) from water (n 4/3). What is the Brewster's angle in this case, the angle of incidence in water, where the angle of refraction in glass is perpendicular to the angle of reflection in water? B) 48° n, 1.33 C) 52 D) 63 tantn/n, Hint: Law of reflection: 0reflection incidence

Explanation / Answer

(12)Apply Brewster law

tan theta = n2/n1

theta = tan^-1 ( n2/ n1)

= tan^-1 ( 4/3/3/2)

= 41.6degree

rounding two significant theta = 42 degree

option A is correct

(13)

tehta = tan^-1 ( 3/2/4/3)

= 48.37 degree

= 48 degree

option B is correct

(21)

Apply Malus law

I = Io cos^2 theta

if unpolarized light falls on a polaroid, then intensily of unpolarized light reduces half of its initial value

I1 = Io/2

option E is correct answer

(22)

Apply Malus law

I = Io cos^2 theta

if unpolarized light falls on a polaroid, then intensily of unpolarized light reduces half of its initial value

I1 = Io/2

I1 = Io/2

I2 = I1 cos^2 theta

= Io/2 cos^2 60

= Io/8

option (c) is correct answer

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