i. Lenses are kept in contact with each other ii. Two lenses kept at a distance d apart from each other.
Give the expression for the focal length of combination of lenses when.
i. Lenses are kept in contact with each other
ii. Two lenses kept at a distance d apart from each other.
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i when lenses are kept in contact then
1/f = 1/f1 + 1/f2
f = f1f2 / f1 + f2
ii. When kept distant apart,
1/f = 1/f1 +1/f2 - d/f1f2
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