Question

a silicon monoxide n=1.45 film of 100 nm thickness is used to coat a glass camera lens n=1.56.what wavelength of light in visible region will be most efficiently transmitted through this system?

Answer 1

For the transmitted light the condition of maximum intensity of transmitted light we have

$2\mu t = \frac{2N+1}{2}\lambda$

here given that

$\mu = 1.45$

t = 100 nm

now we have

$2* 1.45 * 100 nm= \frac{2N+1}{2}\lambda$

now for the wavelength

$\lambda = \frac{580nm}{2N+1}$

now for N = 0

we have

$\lambda = 580 nm$

so the wavelength of light for good transmission will be 580 nm in visible range

Answer 2

Answer:

580 nm

Explanation:

n(silicon mono-oxide) = 1.45

thickness (t) = 100nm

We know that the film thickness is given by:

t =  λ/4n

100 =  λ/4*1.45

λ = 100 * 4(1.45)

λ = 580 nm.