$A$ ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
(TOWARDS THE NORMAL) The light ray bends towards the normal.
When a ray of light travels from an optically rarer medium to an optically denser medium, it slows down and bends towards the normal. Since water $(n \approx 1.33)$ is optically denser than air $(n \approx 1.00)$, a ray of light travelling from air into water will bend towards the normal.
When a ray of light travels from an optically rarer medium to an optically denser medium, it slows down and bends towards the normal. Since water $(n \approx 1.33)$ is optically denser than air $(n \approx 1.00)$, a ray of light travelling from air into water will bend towards the normal.
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