Questions and Answers
Which part of the eye is responsible for controlling the amount of light entering the eye?
Iris
When light passes from air into water, what happens to its speed?
Decreases
What is the angle of reflection when a light ray reflects from a smooth surface?
90 degrees
What happens to the size of the image formed by the eye lens when we focus on a closer object?
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What happens to the focal length of the eye lens when we focus on a nearby object?
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What is the angle of reflection when a light ray reflects from a rough surface?
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When light passes from air into glass, what happens to its speed?
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Study Notes
Eye and Light
- The iris is responsible for controlling the amount of light entering the eye.
Refraction of Light
- When light passes from air into water, its speed decreases.
- When light passes from air into glass, its speed decreases.
Reflection of Light
- When a light ray reflects from a smooth surface, the angle of reflection is equal to the angle of incidence.
- When a light ray reflects from a rough surface, the angle of reflection is not equal to the angle of incidence.
Eye Lens and Focusing
- When we focus on a closer object, the size of the image formed by the eye lens increases.
- When we focus on a nearby object, the focal length of the eye lens decreases.
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