A Lens with a Negative Focal Length of F₁= -15

question 44

Multiple Choice

A lens with a negative focal length of f₁= -15 cm is 25 cm from a lens with a positive focal length of f₂= +20 cm on the same axis. Parallel light from the left is incident on the first lens. The final image formed by this two-lens system is

• A) real and 40 cm from the positive lens.
• B) virtual and 20 cm from the positive lens.
• C) real and 20 cm from the positive lens.
• D) real and 13 cm from the positive lens.
• E) None of these is correct.

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