GS One‑Liners
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5107
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Latest facts first
| # | Question & Answer |
|---|---|
| 4101 |
What are the types of electric charge?
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Positive and Negative
|
| 4102 |
What is electric charge?
-
Property of matter that causes it to experience force in an electric field, measured in Coulombs (C)
|
| 4103 |
How is chromatic aberration minimized?
-
Using combination of convex and concave lenses (achromatic doublet)
|
| 4104 |
What is chromatic aberration?
-
Dispersion of colors causing blurred image in lenses
|
| 4105 |
What is the role of lenses in correcting vision?
-
They adjust the focal point of light on the retina
|
| 4106 |
What is the principle behind optical fibers?
-
Total internal reflection of light within a core with higher refractive index
|
| 4107 |
What is the focal length of a lens or mirror?
-
Distance between the optical center and the focus, where parallel rays converge
|
| 4108 |
How does a telescope form a magnified image?
-
Objective lens forms real image, eyepiece lens magnifies it for observation
|
| 4109 |
How does a compound microscope form a magnified image?
-
Image formed by objective lens acts as object for eyepiece lens, producing a virtual, enlarged image
|
| 4110 |
What is a telescope?
-
Instrument to observe distant objects, can be refracting (lenses) or reflecting (mirrors)
|
| 4111 |
What is a microscope?
-
Optical instrument to view small objects, uses combination of objective and eyepiece lenses
|
| 4112 |
How are vision defects corrected?
-
Myopia: concave lens; Hypermetropia: convex lens; Astigmatism: cylindrical lens; Presbyopia: bifocal lens
|
| 4113 |
What are common defects of vision?
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Myopia (nearsightedness), Hypermetropia (farsightedness), Presbyopia, Astigmatism, Cataract
|
| 4114 |
What is the human eye’s structure?
-
Cornea, lens, iris, retina, optic nerve
|
| 4115 |
Why does the sun appear red at sunrise and sunset?
-
Longer path through atmosphere scatters blue light, leaving red light
|
| 4116 |
Why is the sky blue?
-
Due to Rayleigh scattering, shorter wavelengths (blue) scatter more than longer wavelengths
|
| 4117 |
What is scattering of light?
-
Deviation of light by particles in the atmosphere, causing sky color and reddish sunsets
|
| 4118 |
How is a rainbow formed?
-
By refraction, reflection, and dispersion of sunlight in raindrops
|
| 4119 |
What is dispersion of light?
-
Separation of white light into constituent colors due to different refractive indices
|
| 4120 |
What is magnification?
-
Ratio of image height to object height, $M = h’/h = v/u$
|
| 4121 |
What is the lens formula?
-
$1/f = 1/v – 1/u$
|
| 4122 |
What are concave and convex lenses?
-
Convex lens converges light; Concave lens diverges light
|
| 4123 |
What is the mirror formula?
-
$1/f = 1/v + 1/u$, where f is focal length, v is image distance, u is object distance
|
| 4124 |
What are concave and convex mirrors?
-
Concave: curved inward; Convex: curved outward
|
| 4125 |
Name some applications of TIR.
-
Optical fibers, periscopes, binoculars, prisms in cameras
|