Q3 of 18 Page 165

Identify the mistakes and correct them:

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

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

Kaleidoscope is an instrument which produces ever-changing patterns when rotated. To obtain these patterns, two or more reflectors (mirrors) are placed at an angle to one another. When the eye is placed at one end of the mirrors, the view on the other side is multiplied into a symmetrical pattern.


More from this chapter

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1

The angle between the incident ray and the normal is called __________

(angle of incidence, angle of reflection, angle of refraction)

 2

Fill in the blanks:

1. The working principle of a periscope is __________________


2. A fruit appears to be bigger in a glass of water due to _____________


3. Sound cannot travel in ___________


4. When we touch the ringing bell we can feel the ______________


5. An audible sound has the frequency range of _____________

 3

Identify the mistakes and correct them:

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

 3

Identify the mistakes and correct them:

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