Telescope is a
device which is used to see remote objects.
The first
known practically functioning telescope was invented in the Netherlands
at the beginning of the 17th century.
An Optical
telescope gathers and focuses radiations mainly from the visible part
of the electromagnetic spectrum.Optical telescopes increase the apparent
angular size of distant object as their apparent brightness.
Optical
telescopes are of three kinds.
A)
Refractor Telescope: It uses lens
B)
Reflector Telescope: It uses mirrors
C)
Catadioptric Telescope: It uses mirror with a lens design.
D) Radio
telescope receives radio signals from
distant satellites.
Through broad
spectrum telescope astronomers measure ultraviolet, infrared,
gamma and x-rays.
Spacecraft
are the
machines used to take astronomers in space.
Space
shuttle is the type of space craft which is used to
carry men in space.
The first
space shuttle was launched by NASA (national aeronautics and space
administration) in 1981.
Sub
system is the systems of a spacecraft
that are necessary for an astronomer to live in it.
Spectroscope is a
device used to measure the wavelengths of different
radiations.
A polo
technology has been used to produce a lighter breathing system
for fire-fighters.
European
space agency satellites provide information on fire
locations.
Space
shuttle radar images help to locates ancient cities, roads, and ruins.
The word Telescope is derived
from……word.
a) Greek
The first known practically functioning telescope was invented in…….at the beginning of the 17th century. NTS PST (B) -------2021 a) U.S.A b) U.S.S.R c) Netherlands d) England
