LIGHT AND OPTICS
Light includes electromagnetic waves of all sizes of wavelengths, frequencies, and energies. Light particles, called photons, have properties of particles and waves, a combination that makes light very interesting. With the invention of lasers, we have gained precise control over light and revolutionized many areas of research and technology.
Nature of primary & secondary colour may be shown using this apparatus. Colour mixing takes place when two or more colours come together to form a different colour. This apparatus demonstrates how different colours of light form - from the three primary colours. The three basic colours for mixing light are red, green & blue. There is a control box which controls the intensity of six numbers of LEDs (diodes) which are mounted on a stand. Additive and subtracting colour mixing are demonstrated on the screen.
The kit has been designed to perform a lot of experiment related to the light experiments to find out the wavelength of the light, width of the narrow slit or any type of pattern.
Exp-1 Working of Human Eye (Normal eyes, near sighted eyes, far sighted eye).
Exp-2 Principle of photographic camera.
Exp-3 Principle of Galileo telescope & periscope.
Exp-4 Principle of Kepler telescope.
Exp-5 Principle of Spherical aberration.
Class VIII, Chapter-10, Refraction of light.
Class X, Chapter-11, The human eye.
Class XII, Part-2,Chapter-9, Ray optics & optical instruments.
LED array is seven color LEDs & a white LED, used to demonstrate diffraction at different wavelength. Measure current & voltage across each LED. LED array has a selector switch for all LED’s or individual LED mode.
Optical Bench having a ‘U’ channel with scale printed. It has three feet of which two are adjustable and one is fixed. It is provided with four sliding saddles having pointer. The saddle accepts holders with 10mm dia rod. It is supplied complete with two Lens Holders, Light Source, Slit, White Screen, Translucent Screen (15 x 15 cm). Power Supply for Light source is not included in the scope of supply.
160cm, graduated in mm.
Plastic moulded, hole dia. 10mm
Plastic moulded, rod dia. 10mm, aperture 36 mm, Lens dia.40 mm
The ecliptic and the Zodiacal constellations. How the planets appear to move against the night sky. Use of the Helios outside at night - where should the stars appear in the sky?
The small Tesla Coil produces an alternating high voltage potential which attracts or repels free electrons. When the electrons collide with the gaseous atoms and molecules inside the globe, the gas particles are ionized creating even more electrons, as well as, positive ions. A plasma is formed. When electrons return to the ionized gas, light is produced. Touching the globe with your finger provides a ground, an addition source or sink of electrons. You can also observe super, neat, wow effects by moving a fluorescent tube or neon light near the plasma globe. They will light up in your hands!
It is a kind of instrument for measuring the optical rotation of optically active substances e.g. Sugar. The unit is mounted in a steel box. A 6V bulb present in the base works as a source of light. Light passes through a polarising filter and again through yellow filter to the sample tube. Rotation of the polarised light can be measured by rotatable analyser which is mounted in the top panel with a fixed 0-360° scale. The sample tube may be taken out for sample keeping purpose. Suppled with polarisers, yellow filter and sample tube.
The Light box kit is specially designed for demonstrating basic concepts of reflection, refraction & colour mixing of different colours using various optical components. The kit can be used by an individual student or it can be used for demonstration to a small group of students.
V-I characteristic of a solar cell can be obtained using this apparatus. The ratio of maximum useful power and ideal power can also be calculated. The maximum useful power is the area of largest rectangle that can be formed under the V-I curve. If the voltage and current corresponding to this largest area are denoted by Vm & Im, then the maximum useful power is Vm x Im. The ratio of useful power to the ideal power is called the fill factor. It consists of solar module, decade resistance box module, lamp source, switch and circuit board.