Question

25 What should be the relation between refractive indices for antireflection coating made over a
glass surface?
a pair > ufilm > pglass
b pair <ufilm < uglass
c pair > ufilm <pglass
d uair < ufilm > uglass​

Answer 1

Answer:

Answer as follow

Explanation:

In the case of air and glass, the optimum antireflective coating would have a refractive index of approximately 1.23. No real material has this ideal index, but magnesium fluoride (MgF2) is often used because its refractive index of 1.38 comes closest to the ideal value.

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Answer 2

Answer:

option a is correct.

Explanation:

In an anti-reflection coated glass,

refractive index of coating is chosen such that,

$n_f=\sqrt{n_g*n_{air}}$

where, $n_f$ is the refractive index of the coating,

$n_g$ is the refractive index of the glass,

$n_{air$ is the refractive index of the air.

We can see that in an anti-reflection coating, refractive index of glass is higher than that of coated film and both have refractive index higher than air.

Therefore, the order of refractive indices is

$air > film > glass$

So, option a is correct.

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