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John Dollond invented the achromatic lens. He used a combination of crown and flint glasses to construct the lens.
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What is achromatic lens and what is its relation to power and dispersive power?
An achromatic lens is one without chromatic distortion (gives no colour fringing). The achromatism has no direct relation to power.
What is a major disadvantage of using a lens to gather light in a telescope?
How about a few? Absorption of light through the lens(es). Chromatic aberation, requiring, preferably, a multiple lens like an achromatic or apochromatic lens which increases absorption. Reflection of light off of the objective lens. Maximum exposure to the elements, causing fogging. Maximum diameter of about 40 inches due to gravity. Difficulty of making at least four optical surfaces to reduce chromatiic aberation (and, these must stay aligned for the life of the telescope). Enough?
How long did the starch react with achromatic point?
Achromatic means "without color." During a hydrolysis test, starch auger is used to grow bacteria. An iodine reagent is used to flood the plate. The starch is dyed a blue-brown color. Areas where the starch has been completely digested by the bacteria, are clear. That is known as the achromatic point, or the point at which all the starch has been consumed and the iodine does not dye the auger.
Who invented the two lens system?
The use of a two lens telescope is credited to three people of Netherlands , Hans Lippershey and Zacharias Janssen, and Jacob Metius . Galileo improved on their designs and is generally given the credit of inventing the telescope.Robert Hooke was the first to use a two lens microscope.
Which of these devices helps correct coma in reflector telescopes?
That list of devices is certainly a short one.
Achromatic lens Invented by whom and when?
John Dolland 1758
What does achromatic mean?
Achromatic means "without color". An achromatic lens is a lens that is virtually free from prismatic color distortions.
How is aberration corrected?
using an achromatic lens
Do achromatic lens refract of reflect?
Refract
What are lens constructed so at avoid undesirable color effects?
Achromatic lens.
What is achromatic lens and what is its relation to power and dispersive power?
An achromatic lens is one without chromatic distortion (gives no colour fringing). The achromatism has no direct relation to power.
What is an achromatic lens?
Point in a chromaticity diagram representing an achromatic color.Achromatic means without color so an achromatic point could be black or white.It is the point at which starch no longer gives a positive result (blue color) to Iodine test.
A sentence using the word achromatic?
The distracting violet fringing of the image in the telescope was limited by the use of an achromatic lens system.
What does An achromatic lens consists of?
Achromatic Lenses consist of two or more elements, usually of crown and flint glass that have been corrected for chromatic aberration with respect to two selected wavelengths. by jay-j
Who invented chromatic lens?
the person who invented the chromatic lens
Who invented the first hand lens?
William Julliano invented the first hand lens in 1991
Does achromatic mean colorless in Greek?
Yes. Achromatic does mean colorless in Greek.
