Saturday, July 21, 2018


hello!  friends ,  how are you ?  if , you are preparing for competitive examination you will visit my website : you are now currect place . so , today i am prepared a pdf file about science .  

some details about content of pdf 

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.

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 . 

pdf file details : 

file name :science document detailed  about light ( )
file size : 618 kb
Download : click here 

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