find by construction the position of a lens and the main foci on the principal axis OO' if A1 B1,A2 B2 are respectively the object and the image. what type of lens is this?
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If it is vital getting image of flame on the screen that could project with observing the types of images.
In addition to this, measure with object distance for parallel to main axis that centre of curvature with radius of principal axis.
It involves focal points and light ray passed with behaves when light passed through a lens.
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