When you have your eyes tested, the optician might test different lenses in front of each of your eyes. Each lens changes the direction of light passing through it. This change of direction is known as refraction. People with sharp eyes don't need extra lenses. Each eye already has a perfectly good lens in it.
When a light ray passes through a glass block, it will:
- bend towards the normal when travelling from air to glass. . This is the refraction. The angle of refraction, 'r', is smaller than the angle of incidence, 'i'.
- bend away from the normal when travelling from the glass to the air. The angle of refraction is greater than the angle of incidence.
REFRACTION OF LIGHT IS THE CHANGE OF DIRECTION OF A LIGHT RAY WHEN IT CROSSES THE BOUNDARY BETWEEN 2 TRANSPARENT SUBSTANCES.
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