Q3 of 18 Page 165

Identify the mistakes and correct them:

An optical fibre is a device based on the principle of refraction.

An optical fibre works on the principle of total internal reflection.


When light enters the fibre at a very small angle, it undergoes multiple total internal reflections and reaches the other end. Optical fibre is widely used in communication purposes.


More from this chapter

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3

Identify the mistakes and correct them:

The beautiful pattern that we obtain in a kaleidoscope is because of refraction.

 3

Identify the mistakes and correct them:

Unwanted sound from any loudspeaker that causes discomfort of any kind is called Music.

 4

Match the following:

a. Irregular reflection - Glass slab


b. Multiple reflection - Optic fibre


c. Refraction - Periscope


d. Total internal reflection – Wood

 5

Classify the pairs of media as denser and rarer.

a. Air, water b. Air, glass c. water, glass