A beam of light is incident on a glass slab of refractive index 1.5 at an angle of incidence of 45o. Find the ratio of the width of refracted beam to the incident beam.

Explanation

To solve the problem of finding the ratio of the width of the refracted beam to the incident beam when a beam of light is incident on a glass slab of refractive index 1.5 at an angle of incidence of 45 degrees, follow these steps:

### Step 1: Understand the relationship between the widths of the beams
The ratio of the width of the refracted beam (W_r) to the width of the incident beam (W_i) can be expressed using the cosine of the angles of refraction (r) and incidence (i):
\[ \frac{W_r}{W_i} = \frac{\cos(r)}{\cos(i)} \]

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