NCERT Class VIII Science Solutions: Chapter 16-Light Part 6

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Question 22:

Explain the process which enables us to perceive motion in a cartoon film.

Answer:

The cartoon film we see is actually the projection of static pictures on the screen in a specific order. Usually the static pictures are shown in a sequence at the rate of 24 pictures per second one after the other giving us the perception of movement.

Question 23:

How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?

Answer:

The kaleidoscope gives a number of images formed by reflection from the mirrors inclined to one another. Designers and artists use kaleidoscope to get ideas for new patterns to design wallpapers, Jewellery and fabrics.

Question 24:

Fig shows the word REST written in two ways in front of a mirror. Show how the word would appear in the mirror.

As showing in fig is a written in two ways in front of a mirror. (Q)

Written in Two Ways in Front of a Mirror. (Q)

As showing in fig is a written in two ways in front of a mirror. (Q)

Answer:

As showing in fig is a written in two ways in front of a mirror. (A)

Written in Two Ways in Front of a Mirror. (A)

As showing in fig is a written in two ways in front of a mirror. (A)

Question 25:

Write down the names of parts of the eye in the blank spaces shown in Fig.

As showing in fig is a parts of the eye (Q)

Parts of the Eye (Q)

As showing in fig is a parts of the eye (Q)

Answer:

As showing in fig is a parts of the eye (A)

Parts of the Eye (A)

As showing in fig is a parts of the eye (A)