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A ray of light travelling in a medium of...

A ray of light travelling in a medium of refractive index `mu_1` is incident obliquely at the boundary of a medium of refractive index `mu_2`. The ray may reflect back totally only when `u_1` is _____ `mu_2`.

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To solve the question, we need to understand the concept of total internal reflection (TIR) and the conditions under which it occurs. ### Step-by-Step Solution: 1. **Understanding Refractive Index**: - The refractive index (denoted as `mu`) is a measure of how much light slows down in a medium compared to its speed in a vacuum. - A medium with a higher refractive index is considered denser than a medium with a lower refractive index. ...
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