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Questions and Answers
What does the Law of Reflection state?
What does the Law of Reflection state?
- Angle of incidence is less than angle of reflection
- Angle of incidence equals angle of reflection (correct)
- Angle of incidence is perpendicular to angle of reflection
- Angle of incidence is greater than angle of reflection
Why can light go through a vacuum?
Why can light go through a vacuum?
- Light waves are electromagnetic and can travel through spaces without particles (correct)
- Light is a physical object that can move through anything
- Light is too strong to be stopped by anything
- Light waves are sound waves
What occurs when light moves from a less dense medium to a more dense medium?
What occurs when light moves from a less dense medium to a more dense medium?
- Light travels faster
- Light bends away from the normal line
- Light stops moving
- Light bends towards the normal line (correct)
What is the reason we see different colors?
What is the reason we see different colors?
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What is Lateral Inversion?
What is Lateral Inversion?
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What is the function of the cornea?
What is the function of the cornea?
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Where is the sclera located?
Where is the sclera located?
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What are Convex Lens?
What are Convex Lens?
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What is the main function of the retina?
What is the main function of the retina?
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What are examples of objects that use Concave Lens?
What are examples of objects that use Concave Lens?
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Study Notes
Light and its Properties
- Speed of light: 300,000,000 m/s
- Light can travel through a vacuum because it is an electromagnetic wave, not requiring particles to propagate
- Reflection: the bouncing of light
- Law of Reflection: angle of incidence equals angle of reflection
Refraction and Lateral Inversion
- Refraction: the bending of light as it passes from one transparent medium to another, due to a change in speed
- When light goes from a less dense medium to a more dense medium, it bends towards the normal line
- When light goes from a more dense medium to a less dense medium, it bends away from the normal line
- Lateral Inversion: when an image is flipped, so that left becomes right and right becomes left
Absorption and Transmission
- Absorption: when light strikes an object and is absorbed, rather than reflected or transmitted
- Transmission: when light can pass through an object
- We see colors because the reflected colors reach our eyes, while the absorbed colors do not
- Black appears when all colors are absorbed, while white appears when all colors are reflected
Optical Illusions and Lenses
- Refraction can cause optical illusions, such as a pencil appearing broken when placed in water
- Convex Lens: a converging lens that brings light together, thicker in the middle and thinner on the edges
- Examples of convex lens: magnifying glass, camera lens, eyeglasses
- Concave Lens: a diverging lens that spreads out light rays, thinner in the middle and thicker on the edges
- Examples of concave lens: eyeglasses, cameras, projectors
The Eye
- Sclera: the white outer layer of the eyeball, made of tough collagen fibers
- Function of the sclera: to protect and support the eyeball
- Cornea: the transparent front part of the eye, covering the iris and pupil
- Function of the cornea: to bend and focus light rays entering the eye
- Retina: the innermost, light-sensitive layer of tissue of the eye
- Function of the retina: to detect light and convert it into neural signals for the brain, and to provide signals of shape and color
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Test your knowledge about the speed of light, why light can go through a vacuum, reflection, the Law of Reflection, refraction, and more!
