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The objective of a telescope consists of two lenses kept in contact. One lens has an optical power…
The objective of a telescope consists of two lenses kept in contact. One lens has an optical power of $+2.0\text{ D}$ whereas the other lens has an optical power of $-1.5\text{ D}$. Calculate focal length of the objective.
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From ISC 2025 Physics Paper 1, question 6.