Consider a light ray following the path shown in the figure below. When the ligh

Question

Consider a light ray following the path shown in the figure below. When the light ray travels from Material 1 into Material 2, does the ray gain speed or slow down? The light ray travels more slowly in Material 2 The light ray travels faster in Material 2 The speed of light is 2.997 times 10^8 m/s so it's speed does not change At this interface (figure above), there may be reflected light (not shown) and transmitted light. Consider the reflected light and choose among the following possibilities. If the incident angle is large enough the incoming ray will be totally internally reflected If the incident angle is the Brewster's angle, the reflected light will be polarized Both (A) and (B) A light ray is travelling through a piece of flat glass (n=1.5) that is immersed in water (n=1.33). When the light ray strikes the glass-water interface (glass is the incident medium) it is totally internally reflected. What is the minimum angle of incidence that is consistent with this observation? 22degree 41.8degree 48.8degree 57.2degree 62.5degree

Explanation / Answer

We can clearly see, Light moves towards the normal as it goes from material 1 to materia 2, which means Material 2 has greater index of refraction than material 2.
We know,
v = c/n where, n is refractive index of material.

So,
The light travels slower in material 2.

(6)
At brewster's angle reflected ray is polarised.
Option B is correct !!

(7)
Using Snell's law,
ni * sin(c) = nr * sin(90)
1.5 *sin(c) = 1.33
c = sin^-1(1.33/1.5)
c = 62.5o

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