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Physics CBSE Live product
Class 10 (2026-27)
Light reflection and refraction
Image formation of lens
7.
Power of combination of lens
Question:
2
m.
Select the best answer:
Two lenses of \(+5\ D\) and \(-5\ D\) are placed in close contact. The focal length of the combination is:
\(Zero\)
\(\infty\)
\(Zero\ or\ \infty\)
\(None\ of\ these\)
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