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What is the focal length of concave mirrror and convex lens |
| Answer» Following are the ways to obtain the focal length of the concave mirror:\tA concave mirror is defined as the spherical mirror whose reflecting surface is curved inwards and follows laws of reflection of light.\tThe light rays coming from a distant object can be considered to be parallel to each other.\tIf 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.\tThe image formed by the convex lens is real and can be obtained on the screen.\tf is used to denote the difference between the principal axis P and the focus F of the concave mirror.Following are the ways to obtain the focal length of convex lens:\tThe convex lens is thicker in the middle and thinner at the edges and is also known as the converging lens.\tThe refracted rays from the parallel beam of light converge on the other side of the convex lens.\tIf the image is obtained at the focus of the lens, the image would be real, inverted and very small.\tf is the focal length which is the difference between the optical centre of the lens and the principal focus.\tThe image can be obtained on the screen as the image formed by the lens is real.\xa0 | |