Podcast
Questions and Answers
Which part of the eye is responsible for controlling the amount of light entering the eye?
Which part of the eye is responsible for controlling the amount of light entering the eye?
- Cornea
- Iris (correct)
- Lens
- Retina
When light passes from air into water, what happens to its speed?
When light passes from air into water, what happens to its speed?
- Remains constant
- Decreases (correct)
- Increases
- Becomes zero
What is the angle of reflection when a light ray reflects from a smooth surface?
What is the angle of reflection when a light ray reflects from a smooth surface?
- 45 degrees
- 30 degrees
- 60 degrees
- 90 degrees (correct)
What happens to the size of the image formed by the eye lens when we focus on a closer object?
What happens to the size of the image formed by the eye lens when we focus on a closer object?
What happens to the focal length of the eye lens when we focus on a nearby object?
What happens to the focal length of the eye lens when we focus on a nearby object?
What is the angle of reflection when a light ray reflects from a rough surface?
What is the angle of reflection when a light ray reflects from a rough surface?
When light passes from air into glass, what happens to its speed?
When light passes from air into glass, what happens to its speed?
Flashcards
Iris
Iris
The colored part of the eye that controls the amount of light entering the pupil.
Light speed in water
Light speed in water
The speed of light decreases when it enters a denser medium like water.
Angle of reflection (smooth surface)
Angle of reflection (smooth surface)
The angle of reflection is equal to the angle of incidence when light reflects from a smooth surface.
Image size when focusing on close objects
Image size when focusing on close objects
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Focal length when focusing close
Focal length when focusing close
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Angle of reflection (rough surface)
Angle of reflection (rough surface)
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Light speed in glass
Light speed in glass
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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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