Astronomical Telescopes
Astronomical Telescopes
It is used to observe distinct images of heavenly bodies.
It consists of 2 lenses, the objective lens O of large focal length and...
Microscopes
Simple Microscope or Magnifying glass:
The Magnifying power of a simple microscope is defined as the ratio of the angles subtended by the image and...
Optical Instruments: The Eye
A number of optical devices and instruments have been designed utilizing reflecting and refracting properties of mirrors, lenses and prisms. Periscope, kaleidoscope, binoculars, telescopes,...
Scattering of Light
Scattering of Light
As sunlight travels through the Earth’s atmosphere, it gets scattered by a large number of molecules present in the atmosphere.
According to Rayleigh
where...
Refraction and Dispersion of Light through a Prism
Prism:
Prism is uniform transparent medium bounded between two refracting surfaces, inclined at an angle.
Refraction through a Prism:
A ray of light suffers two refractions on...
Power of a Lens
Power of a lens is defined as the ability of the lens to converge a beam of light falling on the lens.
If more than...
Refraction at Spherical Surfaces and Lenses
Refraction by Spherical Surfaces:
A refracting surface is the part of a sphere separating two transparent media.
The spherical refracting surfaces are of two types:
...
Total Internal Reflection
Total Internal Reflection
When a ray of light enters from a denser medium to a rarer medium, it bends away from the normal. Therefore, the...
Mirror and Types of Mirror
Mirror:
A smooth and highly polished reflecting surface is called a mirror.
Plane Mirror
A highly polished plane surface is called a plane mirror.
Different properties of image...
Reflection of Light
Reflection of Light
The rebounding back of light rays into the same medium on striking a highly polished surface such as a mirror is called...