Two Converging Lenses, the First with Focal Length 25 Cm

question 4

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. Where is the image formed by the first lens?

• A) 17 cm in front of the first lens
• B) 50 cm after the first lens
• C) 75 cm after the first lens
• D) 27 cm after the second lens
• E) 50 cm after the second lens

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Definitions:

Neutralization

A chemical reaction in which an acid and a base react quantitatively to form water and a salt.

Reduction-Oxidation

A chemical reaction in which the oxidation states of atoms are changed, typically involving the transfer of electrons.

KOH

KOH, potassium hydroxide, is a strong alkali used in industry and as a reagent in the laboratory, especially in saponification reactions.

Lithium Hydroxide

A chemical compound with the formula LiOH, used primarily as a precursor in the production of lithium greases and batteries.