Magnifying Glass: a Magnifying Glass Uses a Converging Lens with a Refractive

question 18

Multiple Choice

Magnifying glass: A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye (image at the far point) having a near point of 25 cm and a far point at infinity?

• A) 5.0 x
• B) 3.0 x
• C) 4.0 x
• D) 1.0 x
• E) 2.0 x

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Definitions:

Crustaceans

Members of a subphylum that includes lobsters, crabs, shrimp, barnacles, and their relatives.

Echinoderms

A phylum of marine animals characterized by radial symmetry, a calcareous skeleton, and a water vascular system; includes starfish, sea urchins, and sea cucumbers.

Parasitizes

Describes the action of living as a parasite in or on another organism, exploiting the host for sustenance without mutual benefit.

Biramous Appendages

Appendages with two jointed branches extending from their base. Compare with uniramous appendages.