3 way light switching

The effect of light on growth can be studied under 3 headings light intensity, light quality and duration of light. Growth is generally favoured by darkness, but light is indispensable because of its role in the manufacture of food. Young ..

In a game, a target is moving randomly on a vertical screen of length 8 m and height 9 m. A light source placed at 2 m in front of the board can be turned on with a switch. If the target is found with in the lighted portion of the screen a prize is won. Light..

Light is a form of energy and can be transformed into other forms of energy. You would have observed the path of 'a beam of light' inside a room. This beam is nothing but the scattered light produced by the dust particles and this beam of light becomes invisi..

Light is a form of energy and can be transformed into other forms of energy. You would have observed the path of 'a beam of light' inside a room. This beam is nothing but the scattered light produced by the dust particles. Beam of light becomes invisible if ..

In a homogenous transparent medium light travels in a straight line and this is known as rectilinear propagation of light. This can be demonstrated by the following experiment: Take three cardboards A, B and C and make a pinhole at their centers. Place a burning candle on one si..

In a homogenous transparent medium light travels in a straight line and this is known as rectilinear propagation of light. This can be demonstrated by the following experiment: Take three cardboards A, B and C and make a pinhole at their centres. Place a burning candle on o..

Place a prism on a white sheet of paper with the triangular face on the sheet and trace its boundary ABC. Fix two pins T and S on one side. Place the prism on the boundary ABC. Looking through the other side fix two more pins Q and R in such a way that the all four pins appear to be ..

This property is related to the parallelism of the laser beam. As for star light, the size of the focused spot for a laser beam is limited only by diffraction effects and not by the size of the source. Flux densities for focused laser light of 10 1 5 W cm - 2 are readily ac..

Polaroids are used in sun glasses. They reduce the intensity and the glare by cutting down the horizontally polarized light. Polarized light is used in photo elastic stress analysis. For 3-D view, special type of glasses, which have polaroids with perpendicular axes..

In 1856, James Clark Maxwell proposed that light and other forms of radiant energy propagate themselves in the form of waves, through space. These waves have electric and magnetic fields associated with them and are called electromagnetic waves or electromagnetic radiation. The important ..