The picture shows the size of the pupil under two different conditions. What makes the pupil change size between condictions 1 and 2?

When the amount of light entering the eye is reduced, such as in a dimly lit room, the pupil dilates or becomes larger to allow more light to enter the eye. This is controlled by the muscles in the iris, which contract to increase the size of the pupil. On the other hand, when the amount of light entering the eye is increased, such as in bright sunlight, the pupil constricts or becomes smaller to reduce the amount of light entering the eye. This is also controlled by the muscles in the iris, which relax to decrease the size of the pupil.

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 3

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The picture shows a candle in front of two plane mirrors joined at their sides.

What will increase the number of images formed on the mirrors?

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Important Questions on Light

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 5

Reema has a multi-coloured disc. She finds that the disc appears white when she spins it rapidly.

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What can be concluded from the picture?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 6

Which of these objects reflects light?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 7

The diagram shows the basic parts of human eye.

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Which part protects the human eye from injury?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 8

The picture shows the size of the pupil under two different conditions.

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What makes the pupil change size between condictions 1 and 2?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 9

Light is falling on surface

S_{1}, S_{2}, S_{3}

as shown in the figure below:
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Surfaces on which the angle of incidence is equal to the angle of reflection is/are:

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 10

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure below. The ray of light coming out of the hole falls on a mirror.
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