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History of Snell's Law

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For the same value of angle of incidence, the angle of refraction in 3 media A, B and C are 15 degrees, 25 degrees and 35 degrees respectively. In which medium would the velocity of light be minimum

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Q. For the same angle of incidence of 45° the refraction angle in 3 transparent media A, B and C are 25°, 30° and 45° respectively. In which medium is the speed of light minimum and in which medium maximum?

Q. If a ray of light travelling in a medium is incident at an angle of 60 degrees on an interface and the angle of refraction is 70 degrees, find the angle of deviation.

Q. A light ray in medium (Refractive index

= 5 / 3

) making an angle of

30^{\circ}

with normal,enters another medium. The angle in other medium is

{sin}^{- 1} (5 / 6)

. How many minimum degrees the incident angle must be increased such that the ray is completely reflected.

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