in an astronomical telescope focal length of the two lenses are 0.3 M and 0.05 m in normal adjustment the distance between them is
Answers
Astronomical telescope (Radio Telescope designed to collect and record electromagnetic radiation from cosmic sources) that picks up electromagnetic radiations (Radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge) in the radio-frequency range from extraterrestrial sources.
The astronomical telescope makes use of two positive lenses: the objective, which forms the image of a distant object at its focal length, and the eyepiece, which acts as a simple magnifier with which to view the image formed by the objective. Its length is equal to the sum of the focal lengths of the objective and eyepiece, and its angular magnification is -fo /fe , giving an inverted image.
The astronomical telescope can be used for terrestrial viewing, but seeing the image upside down is a definite inconvenience. Viewing stars upside down is no problem. Another inconvenience for terrestrial viewing is the length of the astronomical telescope, equal to the sum of the focal lengths of the objective and eyepiece lenses. A shorter telescope with upright viewing is the Galilean telescope.
The world’s largest and most advanced astronomical observatory, with a telescope that will allow astronomers to study the universe in unprecedented detail, is being set up on Mauna Kea in Hawaii.
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● Answer -
d = 0.35 m = 35 cm
● Explanation -
# Given -
f1 = 0.30 m
f2 = 0.05 m
# Solution -
Distance between two lenses in normal adjustment of astronomical telescope is given by -
d = f1 + f2
d = 0.30 + 0.05
d = 0.35 m
d = 35 cm
Therefore, distance between two lenses in normal adjustment of astronomical telescope is 35 cm.
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