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Questions and Answers
What part of the eye is responsible for focusing light onto the retina?
What part of the eye is responsible for focusing light onto the retina?
- Cornea
- Vitreous fluid
- Lens (correct)
- Optic nerve
The optic nerve connects the eye directly to the retina.
The optic nerve connects the eye directly to the retina.
False (B)
What is the primary function of the vitreous fluid in the eye?
What is the primary function of the vitreous fluid in the eye?
maintains the shape of the eye
What happens to a wave when it passes from one medium into another denser medium?
What happens to a wave when it passes from one medium into another denser medium?
The Angle of Incidence is always equal to the Angle of Refraction.
The Angle of Incidence is always equal to the Angle of Refraction.
___ waves have the longest wavelength and are commonly used in radios and TVs.
___ waves have the longest wavelength and are commonly used in radios and TVs.
Match the types of electromagnetic radiation with their uses:
Match the types of electromagnetic radiation with their uses:
What is the range of visible light wavelengths that humans can see?
What is the range of visible light wavelengths that humans can see?
The part of the eye that controls the size of the pupil is called the ______.
The part of the eye that controls the size of the pupil is called the ______.
Which type of electromagnetic radiation can be hazardous to life at high intensities?
Which type of electromagnetic radiation can be hazardous to life at high intensities?
Match the following types of wave interactions with their definitions:
Match the following types of wave interactions with their definitions:
Gamma rays can pass through most substances and are commonly used for heating.
Gamma rays can pass through most substances and are commonly used for heating.
What is the wavelength range of the infrared radiation?
What is the wavelength range of the infrared radiation?
What is the main function of the cornea in the eye?
What is the main function of the cornea in the eye?
Objects that are transparent absorb all wavelengths of light.
Objects that are transparent absorb all wavelengths of light.
What principle explains that the angle of incidence equals the angle of reflection?
What principle explains that the angle of incidence equals the angle of reflection?
Flashcards
What are waves?
What are waves?
The transfer of energy through a medium, like air or water.
What is a medium?
What is a medium?
The material or substance a wave travels through.
What is transmission?
What is transmission?
When a wave passes through an object.
What is reflection?
What is reflection?
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What is absorption?
What is absorption?
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What is the angle of incidence?
What is the angle of incidence?
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What is the angle of reflection?
What is the angle of reflection?
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What is refraction?
What is refraction?
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Lens (Eye)
Lens (Eye)
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Vitreous Fluid
Vitreous Fluid
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Retina
Retina
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Optic Nerve
Optic Nerve
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Electromagnetic Spectrum
Electromagnetic Spectrum
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Radio Waves
Radio Waves
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Microwaves
Microwaves
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Infrared Radiation (IR)
Infrared Radiation (IR)
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Study Notes
Electromagnetic Waves
- Light is made of electromagnetic waves.
- Waves transfer energy through a medium.
- A medium is anything the wave travels through, like air or water.
- Waves have a specific structure (see diagram).
- Amplitude is the wave's height.
- Wavelength is the distance between peaks or troughs.
Wave Interactions
- Electromagnetic waves interact with surfaces in three ways:
- Transmission: The wave passes through the object.
- Reflection: The wave bounces off the object.
- Absorption: The wave's energy is absorbed into the object.
Reflection
- The Law of Reflection states that the angle of incidence equals the angle of reflection.
- The normal is a line perpendicular to the surface at the point of impact.
Refraction
- Refraction occurs when a wave changes direction as it passes from one medium to another.
- If the wave enters a denser medium, it bends towards the normal.
- If the wave enters a less dense medium, it bends away from the normal.
Color
- Different colors of visible light correspond to different wavelengths.
- Visible light ranges from about 380 to 750 nanometers (nm).
- Objects appear different colors based on how they absorb, reflect, and transmit light.
- Transparent objects transmit light.
- Objects absorb a color of light will not show that color.
- Objects reflect a color of light will show that color.
The Eye
- The human eye only sees light that enters it.
- Light is reflected by objects and then enters the eye.
- Key parts of the eye:
- Cornea: A convex surface that focuses light.
- Pupil: Controls the amount of light entering the eye.
- Iris: Controls the size of the pupil.
- Lens: Focuses light onto the retina.
- Retina: Where the image is projected.
- Vitreous fluid: Maintains the eye's shape.
- Optic nerve: Connects the eye to the brain.
Electromagnetic Spectrum
- Visible light is a part of a larger range of electromagnetic radiation.
- Types of EM radiation include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
- Each type of radiation has a specific wavelength range.
- Different types of EM radiation have different uses.
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