The figure below shows light reaching a polarizing sheet whose polarizing direct

Question

The figure below shows light reaching a polarizing sheet whose polarizing direction is parallel to y-axis. We shall rotate the sheet 40 degree clockwise about the light's indicated line of travel. a) If the light is initially unpolarized, during this rotation, the fraction of the initial light intensity passed by the sheet: Increase Decrease Remain the same b) If the light is initially polarized parallel to the y-axis, during this rotation, the fraction of the initial light intensity passed by the sheet: Increase Decrease Remain the same Green laser light with lambda = 532 nm is incident on a rectangular diamond (n_1 = 2.42) from air (n_air = 1.00) as shown in the figure. What is the angle that the refracted ray in the diamond makes with the normal to the surface? A. 20.1 degree B. 15.4 degree C. 40.0 degree D. 16.5 degree E. 62.4 degree b) What if the light travelling inside the diamond strikes a boundary with the air, what is the angle beyond which the light will always be totally internally reflected? A. 24.4 degree B. 90.0 degree C. 0.00 degree D. 45.6 degree E. 57.3 degree

Explanation / Answer

solving first question of the page

Q4

if light is unpolarised

after passing through polarisor

its intensity will become half before also and after also

so it will remai same

(b)if light is polarised parallel to y axis

initial intensity=I*cos^(0)=I

after intensity=Icos^2(40)=0.59I

so it decreases

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