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Questions and Answers
What is the primary function of a lens in optical devices?
What is the primary function of a lens in optical devices?
- To reflect light back to the source
- To absorb light completely
- To alter the color of light
- To focus or disperse light beams by refraction (correct)
How do concave lenses assist individuals with nearsightedness?
How do concave lenses assist individuals with nearsightedness?
- By changing the color of light to enhance visibility
- By spreading light rays before they enter the eye (correct)
- By bending light rays inward to a single point
- By thickening the lens to magnify distant objects
What type of lens is used to correct farsighted vision?
What type of lens is used to correct farsighted vision?
- Biconcave lens
- Cylinder lens
- Concave lens
- Convex lens (correct)
What is a characteristic feature of convex lenses?
What is a characteristic feature of convex lenses?
Why are systems with multiple lenses, like in modern microscopes, beneficial?
Why are systems with multiple lenses, like in modern microscopes, beneficial?
What happens to light rays when they pass through a concave lens?
What happens to light rays when they pass through a concave lens?
Which optical device commonly utilizes convex lenses to magnify objects?
Which optical device commonly utilizes convex lenses to magnify objects?
What type of vision do concave lenses correct?
What type of vision do concave lenses correct?
Flashcards
Lens
Lens
A transmissive optical device that focuses or disperses a light beam by refraction.
Concave Lens
Concave Lens
A lens that is thicker at the edges and thinner in the middle. It causes light rays to diverge (spread out).
Concave Lens (Application)
Concave Lens (Application)
It's used to correct nearsightedness (myopia), where people can see nearby objects clearly but distant objects appear blurry.
Convex Lens
Convex Lens
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Convex Lens (Application)
Convex Lens (Application)
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Compound Lens
Compound Lens
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Objective Lens
Objective Lens
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Ocular Lens
Ocular Lens
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Study Notes
Lenses
- Lenses are transmissive optical devices that either converge or disperse light through refraction.
- Lenses can focus light into a smaller area or disperse it, depending on the type of lens.
- Lenses are used in many optical devices including glasses, microscopes, telescopes, and cameras.
Concave Lenses
- Concave lenses are thicker at the edges and thinner in the middle.
- When light passes through a concave lens, the light rays diverge (spread out).
- Images formed by concave lenses are upright and smaller than the object.
- Concave lenses are used to correct nearsightedness.
- Nearsighted people have difficulty seeing distant objects clearly.
- Concave lenses spread out the light rays so they reach the eye correctly.
Convex Lenses
- Convex lenses are thinner at the edges and thicker in the middle.
- When light passes through a convex lens, the light rays converge (come together).
- Images formed by convex lenses can be either upright or inverted, magnified or reduced.
- Convex lenses are used to correct farsightedness.
- Farsighted people have difficulty seeing nearby objects clearly.
- Convex lenses converge the light so it focuses on the retina.
- Convex lenses are used in magnifying glasses, microscopes, and other optical devices.
- Microscopes often use a combination of lenses for stronger magnification (e.g., 40x or more).
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