Optical InstrumentsDispersion

andColor

Prepared By:Angelica V. Villegas

Optical Instruments

The devices which are used in various purposes like microscope, telescopes, lens, magnifying lens, mirror, astronomical telescope, glass etc.

Optical LensesOptical Lenses play the most important roles in optical instruments.

Two Basic Types of Optical Lenses

1.Concave Lens2. Convex Lens

1.Concave LensConcave lenses diverge light rays which enter into that and for the same reason concave lenses are also called as DIVERGING LENSES.

THREE TYPES OF CONCAVE LENS

2. Convex LensConvex lenses converge light rays which enter into that and for the same reason convex lenses are also called as CONVERGING LENSES.

THREE TYPES OF CONVEX LENS

The different type of equipment that uses optical lenses and or

optical mirrors and work on their principles is called Optical

Devices

Optical Devices

A concave lens is used as a Door Eye. The lens is fixed on the main door of a house as shown in fig

below.

Optical Storage Devices

Examples

1. A Camera is used for taking photographs.

2. Binocular is a device which is used the far off objects clearly.

3. Electric Cells are electronic devices which senses and converts light energy to electrical voltages.

4. Optical prisms are used for reflecting light using the principle of total internal reflections.

HYPERMETROPIAHyperopia, also known as farsightedness, long-sightedness or hypermetropia, is a defect of eye as the light is focuses at a point behind the retina not on the retina of the eye.

Myopia or Near sightedness is a deficiency of an eye, mostly due to error occurs with the focal length of the lens of the human eye.

MYOPIA

CHROMATIC DISPERSION or DISPERSION

In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency.

RAINBOWThe most familiar example of dispersion.

COLORColor is a function of the human visual system, and is not an intrinsic property. Objects don't "have" color, they give off light that "appears" to be a color.

References:http://physics.tutorvista.com/light/optical-instruments.htmlhttp://physics.info/color/https://en.wikipedia.org/wiki/Dispersion_(optics)