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Answer the following.
What is the focal length of ?
What is the focal length of $L_1$?
Answer
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From ISC 2025 Specimen Physics Paper 1, question 14(i).
Check your working with the Lens and mirror calculator: image distance, magnification and nature for any lens or mirror, with the ray diagram.
Check your working with the Physics formula calculator: about 145 ISC Physics formulas: fill in what you know, with units, and get the rest.