Question

can someone help me with this? (I keep getting answers from fake accounts I think lol)
Light with a wavelength of 466 nm in air is incident on a thin polymer film (n = 1.3) sitting on a glass substrate (n = 1.6). If the light has an angle of incidence of 68° determine the minimum thickness in nanometers of the polymer that will produce maximum reflection at that angle for that wavelength.

Answer 1

Answer:

Given data

<br> Power of light emitted P =150 W <br> Wavelength of light emitted

<br> To find

<br> No. of photons emitted by the lamp in one second n = ? <br> Each photon has energy E =hv <br> v frequency of light <br> If N photons emitted, then the total energy radio Nhv. <br> Average power

<br> But n=

is the No. of photons emitted per sec. <br>

where

<br> So

<br> If all the power is not radiated then the effective power = rated power

efficiency <br>

The number of photons emitted per sec. <br>

[ where

- efficiency ] <br>

<br>

<br>

<br>