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Intensity of image decreased
It depends completely on the object. The mirror has to be of at least half the height of the object. Otherwise there will be no image of the object on the mirror.
Half the radius of the mirror, also known as the focal point.
according to the formula h/2,the minimum size of the plane mirror must be half the size of the object.
The convex lens will form complete image of an object, even if its one half is covered with black paper. It can be understood by the following two cases. Case I When the upper half of the lens is covered In this case, a ray of light coming from the object will be refracted by the lower half of the lens. These rays meet at the other side of the lens to form the image of the given object, as shown in the following figure. Case II When the lower half of the lens is covered In this case, a ray of light coming from the object is refracted by the upper half of the lens. These rays meet at the other side of the lens to form the image of the given object, as shown in the following figure.
Then the figure has line symmetry.
Symetrical
its either reflecting i think!! im not sure!!
An image has Reflectional Symmetry if there is at least one line which splits the image in half so that one side is the mirror image of the other. Reflectional symmetry is also called line symmetry or mirror symmetry because there is a line in the figure where a mirror could be placed, and the figure would look the same.
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The definition of a line of symmetry is a line that can be draw down the center of any shape or object to show mirror image of the other side. where each side is a mirror image of the other side. Now for a horizontal one, it just means that if you cut the figure in half, horizontally it will make a mirror image.
Symmetry
The shape is said to have lateral symmetry.
Intensity of image decreased
It is a line of symmetry.
It must be the mirror image of the original half strand. (and the other strand, which is the mirror of the first is making the mirror of the mirror ... the original !)
All those Alkanes are symmetrical in which half of molecule is mirror image of other half, as Ethane,Butane,2,3-dimethyl butane,2,2,3,3-tetramethyl butane and other alkanes.