Saved Bookmarks
| 1. |
What happens to the light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geomatrical characterstic of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb? |
|
Answer» Solution :INTENSITY of LIGHT is reduced to one fourth because the light beam spreads as it approaches into a SPHERICAL region of area `4pir^2`,i.e., `Iprop1//r^2`. But laser beam dose not spread, HENCE its intensity remains constant. Laser beam is is unidirectional, monochromatic and coherent light, whereas the light from a bulb does not POSSESS the above properties. |
|