Fill in the following blanks with suitable words:(a) Light travelling along a normal is refracted.(b) Light bends when it passes from water into air. We say that it is .

Academic Physics NCERT Class 10

(a) Light travelling along a normal is not refracted.

Explanation

If the light ray hits the glass block at 90° along the normal (that is, perpendicular to the glass block):

(b) Light bends when it passes from water into air. We say that it is refracted.

Explanation

The angle of refraction or the amount of bending of light depends on the refractive index $(μ)$ of the two media.

When light passes through a high refractive index, like water (slower medium or optically denser medium) to a low refractive index, like air (faster medium or optically rarer medium) its speed increases and bends away from the normal, making the angle of refraction larger than the angle of incidence.

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Updated on: 10-Oct-2022

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