A lens made of material of Refractive index u2 is surrounded by a medium of Refractive Index u1. The focal
length f is related as
1.f∝(u2-u1)
2.f∝u1/(u2-u1)
3.f∝(u2+u1)
4.f∝u1/(u2+u1)
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Answer:
2
Explanation:
the answer is 2 because I think
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