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Experiment 23 Rectilinear Propagation of Light

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Genia Lia Fermil

on 30 September 2012

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Transcript of Experiment 23 Rectilinear Propagation of Light

Rectilinear Propagation of light is the technical terminology applied to the principle that "lights travels in a straight line" in a homogenous medium as long as it is not reflected, refracted or absorbed. Rectilinear Propagation of Light What is Illuminance? -is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. Thanks for Listening. Have a great day ahead! :) What is Illumination? Luminous intensity- is the brightness of a light source . It is expressed in terms of candela. Formula:
Illuminance= (Luminous Intensity)/((Distance of Source)2) The characteristics of an image produced by a pinhole camera

The image produced by a pinhole camera is usually smaller than the object and appears to be inverted on both the vertical and horizontal axis when compared to the actual object. The image itself can be called "real" because it is visible on the screen.

Characteristics of the image:

* generally smaller than the object
* vertical inversion (upside-down)
* horizontal inversion (symmetric)
* real

The rays coming from the object which pass through the pinhole must converge in order to cross at the level of the hole. Then, once inside the pinhole, the rays diverge. The vertical and horizontal inversions of the image when compared to the object can thus be explained by simple geometric logic. The analysis of the image produced by a pinhole camera demonstrates the rectilinear propagation of light. Umbra
- (Latin for "shadow") is the innermost and darkest part of a shadow, where the light source is completely blocked by the occluding body. An observer in the umbra experiences a total eclipse.

Penumbra
- (from the Latin paene "almost, nearly" and umbra "shadow") is the region in which only a portion of the light source is obscured by the occluding body. Antumbra
-(from Latin ante, 'before') is the region from which the occluding body appears entirely contained within the disc of the light source. If an observer in the antumbra moves closer to the light source, the apparent size of the occluding body increases until it causes a full umbra. An observer in this region experiences an annular eclipse, in which a bright ring is visible around the eclipsing body. Light propagates in straight lines
from a source.
Makes triangulation, surveying,
star location, etc. possible.

-This property of light was known to the ancients.
Without it, our ability to locate objects around us would become
much more complex, even impossible.
Try imagining a world in which light travels in curves
of some sort. Could we even make sense of such a world? A
universe with curved light would likely have other unusual
properties as well. It is likely that the kind of long term stability and predictability needed for the evolution of life requires straight line propagation of light.

It is true that near extremely large and dense masses
such as black holes, light does curve. But when that curvature is significant, the tidal forces on ordinary sized objects would be so large as to tear them (and us ) apart.
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