When does a light ray at the interface of two media not deviate?

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When does a light ray at the interface of two media not deviate?

PRADEEP KUMAR 16th Nov, 2021

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PRADEEP KUMAR 16th Nov, 2021

When a light ray is incident perpendicular to a surface's interface, it does not deviate.

When a light beam strikes a surface at a greater than critical angle, it does not refract but instead reflects back into the original medium.

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