(a) The speed of light inside a material is 1.7 x 10 8 m/s. What is the refracti

ID: 1440725 • Letter: #

Question

(a) The speed of light inside a material is 1.7 x 108 m/s. What is the refractive index

of this material.

(b) A light ray traveling in air strikes the surface of a piece of glass of refractive

index 1.55, making an angle of 75° with the normal. At what angle it will refract

inside the glass.

refractive index 1.51, making certain angle i with normal. If the angle of

refraction is 35°, find the angle of incidence i ?

(d) You are passing by a small pool full of a clear liquid. You don’t know if

the liquid is water or something else. You checked that the apparent depth of the

pool is 4 m. You jumped inside the pool and found that the real depth of the pool

is 6 m. What is the index of refraction of the liquid inside the pool? Using table

23.1 in the textbook and find what liquid is there in the pool.

( a )

From the definition of refractive index,n

n = c / V

Here, c is speed of light

n = 3 x108 m/s / 1.7 x 108 m/s = 1.764

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Use Snell's law

n1 sin 1 = n2 sin2

( 1 ) sin 75° = ( 1.55 ) sin2

Solve for 2

2 = 38.54o

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Use Snell's law

n1 sin 1 = n2 sin2

( 1.33 ) sin 1 = ( 1.51 ) sin35o

Solve for 1

1 = 40.6o

(Please post other quetions separately)

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