Question: A 45 45 90 prism is immersed in water. A ray of light is incident normally on one of its shorter faces. What

A 45° – 45° – 90° prism is immersed in water. A ray of light is incident normally on one of its shorter faces. What is the minimum index of refraction that the prism must have if this ray is to be totally reflected within the glass at the long face of the prism?

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