To determine rough focal length of Convex lens by obtaining image of a distant
object.
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A concave mirror is defined as the spherical mirror whose reflecting surface is curved inwards and follows laws of reflection of light.
The light rays coming from a distant object can be considered to be parallel to each other.
If the image formed is real, inverted and very small in size, then the parallel rays of light meet the point in the front of the mirror.
The image formed by the convex lens is real and can be obtained on the screen.
f is used to denote the difference between the principal axis P and the focus F of the concave mirror.
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