Two Converging Lenses, the First with Focal Length 25 Cm

question 37

Multiple Choice

Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Which of the following characteristics does the final image have?

• A) real and upright
• B) real and inverted
• C) virtual and upright
• D) virtual and inverted
• E) none of these choices are correct

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Definitions:

Modus Tollens

A logical argument form where the contrapositive of a premise is used to infer the negation of the hypothesis.

Hypothetical Syllogism

A logical argument composed of two conditional statements and a conclusion, based if the first premise is true, then the second one follows.

Modus Ponens

A valid form of argument in which if a conditional statement (“if p then q”) and its antecedent (“p”) are true, then the consequent (“q”) is also true.

Modus Tollens

A form of deductive argument that takes the form "If P, then Q. Not Q. Therefore, not P," which is used to derive a conclusion from a hypothesis by negation.