Question

if sunlight with intensity 1000w/m2 shines on an engineered material with index of refraction 50 at normal incidence, calculate the intensity of the light that is transmitted into the material.

Answer 1

The intensity of 25 x 10⁶W/m² is transmitted into material with 50 index of refraction.

Given- Intensity(i) = 1000W/m²

α=50 (index)

Theoretical Aspect-

1. An optical intensity means optical power per unit area.
2. Optical intensities are understood as parameters that are averaged for one complete cycle of oscillation.
3. Intensity can also be magnitude of poynting vector.
4. When light is received by a surface , an optical intensity causes irradiance.
5. Irradiance refers to cosine of angle against normal direction.

• To find transmitted intensity (I) we need to employ following equation-

$I=\frac{\alpha i^2}{2}$

calculations-

I= 50 (10³)²/2

=25 x 10⁶W/m²

To understand more about  intensity -

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