Question

If in a medium 'A' speed of light is reduced by 0.15% calculate the refractive index of that medium relative to a medium 'B' in which speed of light is reduced by 0.10%
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Answer 1

Answer:

Speed of light in air is c. Let the refractive index of medium w.r.t air n.

Speed of light in medium decreases by 40% of c.

Thus speed of light in medium v=0.6c

Using n=

v

c

∴ n=

0.6c

c

⟹ n=

6

10

=1.67

Explanation:

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Answer 2

Answer:

(a) The index is found to be

n = c/v = (3.00 x 108 m/s)/(2.76 x 108 m/s) = 1.09.

(b) This does not equal any of the indices of refraction listed in the table. It is closest to air, which suggests it is some slightly denser gas.