Two Thin Lenses (Focal Lengths F₁ and F₂)are in Contact

question 17

Multiple Choice

Two thin lenses (focal lengths f₁ and f₂) are in contact.Their equivalent focal length is:

• A)f₁ + f₂
• B)f₁f₂/(f₁ + f₂)
• C)1/f₁ + 1/f₂
• D)f₁ - f₂
• E)f₁(f₁ - f₂)/f₂

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