Question

7. When initially-unpolarized light passes through three polarizing filters, each oriented at 45 degree angles from the preceding filter, _____ of the initial light passes through the last filter.

Answer 1

Step-by-step explanation:

Let the intensity of unpolarised light be I₀ . After passing through the first polarising filter , the intensity is I₀ / 2 .

After second filter , the intensity will be I₀ / 2 x cos²45 = I₀ / 4

After third filter , the intensity will be I₀ / 4 x cos²45 = I₀ / 8 .

So,

1 / 8 the of initial light passes through the last filter .