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Two thin lenses having optical powers of and are placed in contact with each other. The focal…
Two thin lenses having optical powers of $-8\text{ D}$ and $+12\text{ D}$ are placed in contact with each other. The focal length of this combination is:
- (a)$+0\cdot25\text{ m}$
- (b)$-0\cdot25\text{ m}$
- (c)$+0\cdot25\text{ cm}$
- (d)$-0\cdot25\text{ cm}$
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From ISC 2023 Specimen Physics Paper 1, question 1(A)(iv).