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some details about content of pdf
some details about content of pdf
REFLECTION
OF LIGHT
1)The angle of incidence is equal to the angle of reflection.
2)The
incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie
in the same plane.
Uses
of Concave mirrors.
Concave
mirrors are commonly used in torches, search-lights and vehicles headlights to
get powerful parallel beams of light.
They
are often used as shaving mirrors to see a larger image of the face. The dentists
use concave mirrors to see large images of the teeth of patients.
Large
concave mirrors are used to concentrate sunlight to produce heat in solar
furnaces.
Uses of
convex mirrors
Convex
mirrors are commonly used as rear-view (wing) mirrors in vehicles, enabling the
driver to see traffic behind him/her to facilitate safe driving. They always
give an erect, though diminished, image. Also, they have a wider field of view
as they are curved outwards. Thus, convex mirrors enable the driver to view
much larger area than would be possible with a plane mirror.
REFRACTION OF LIGHT
when a thick
glass slab is placed over some printed matter, the letters appear raised when
viewed through the glass slab the bottom of a tank or a pond containing water
appears to be raised seen a pencil partly immersed in water in a glass tumbler.
It appears to be displaced at the interface of air and water.
A lemon kept
in water in a glass tumbler appears to be bigger than its actual size, when
viewed from the sides.
The
following are the laws of refraction of light.
(i) The
incident ray, the refracted ray and the normal to the interface of two
transparent media at the point of incidence, all lie in the same plane.
(ii) The
ratio of sine of angle of incidence to the sine of angle of refraction is a
constant, for the light of a given colour and for the given pair of media. This
law is also known as Snell’s law of refraction.
If i is the
angle of incidence and r is the angle of refraction, then,
Sin i/Sin r
= constant
The one with
the larger refractive index is optically denser medium than the other. The
other medium of lower refractive index is optically rarer. The speed of light
is higher in a rarer medium than a denser medium.
The light
from the Sun constitutes parallel rays of light. These rays were converged by
the lens at the sharp bright spot formed on the paper. In fact, the bright spot
you got on the paper is a real image of the Sun. The concentration of the sunlight
at a point generated heat. This caused the paper to burn .
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file name :science document detailed about light ( www.learningknowledg.ml )
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