by Rajan Gupta | Aug 27, 2020 | Universe
In the universe, stars are not distributed evenly. Instead these stars clump together to form large clusters called galaxies. Thus, a galaxy is a large group of billions of stars. Galaxies also contain large clouds of hydrogen gas and dust particles. From these gas...
by Rajan Gupta | Aug 27, 2020 | Universe
The vast surrounding space around us which consists of solar system, stars, galaxies, gases and dust particles is called universe. Our universe was formed about fifteen billions years ago by an explosion called Big-Bang. There are approximately 100 billion (1011)...
by Rajan Gupta | Aug 25, 2020 | Optical Instruments
A Galilean Telescope or a terrestrial telescope is an optical instrument which is used to see the magnified image of distant objects on earth. Galilean telescope consists of a convex lens as objective lens but a concave lens as eye piece. It always forms erect images...
by Rajan Gupta | Aug 25, 2020 | Optical Instruments
A telescope is an optical instrument which is used to see the distant objects. Telescopes are of two types: 1. Astronomical telescope 2. Galilean telescope or Terrestrial telescope Astronomical Telescope An astronomical telescope is an optical instrument which is...
by Rajan Gupta | Aug 25, 2020 | Optical Instruments
A compound microscope is an optical instrument consisting of two convex lenses of short focal lengths which is used for observing the highly magnified images of tiny objects. The compound microscope can magnify the image of a tiny object up to 1000. Principle of...
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