# A ray of light falls normally on a face of a glass slab. What are the values of values of angle i and angle r. B) Light enters from air to diamond which has refractive index of 2.52. Calculate the speed of light in diamond

2
by PrincessManshi

• Brainly User
2014-11-25T21:13:59+05:30
A) Both i, r are equal to zero, i=r=0. B) . Speed of light in diamond = speed in vacuum/refractive index. V=1.19×.
2014-11-26T06:03:16+05:30

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A)
when the ray falls normally on a surface, angle of incidence is 0.
since μ₁ Sin i = μ₂ sin r    =>  r is also zero.  The ray goes straight in to the glass medium and emerges out of glass slab at the other surface also at  i = 0 and r = 0.

B)
Refractive Index is defined as the ratio of speed of light in vacuum divided by speed of light in the medium.  It is also calculated by the formula: Sin i / Sin r.

μ = 2.52 = 3 * 10⁸ m /sec / v

v = 3 * 10⁸ / 2.52 = 1.19 * 10⁸ meters / sec

thanks manshi and u r welcom
:-)