A Microscope Has an Objective Lens of Focal Length 1

question 22

Multiple Choice

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm.It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm.A blood sample is placed 1.50 mm from the objective.How far apart are the lenses?

• A)20 mm
• B)21 mm
• C)23 mm
• D)41 mm

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Definitions:

Proportion

A numerical ratio or fraction that expresses the relationship between a part and the whole.

Ectoparasitic Infection

An infection or infestation caused by parasites that live on the outer surface of the host's body, such as fleas, lice, or ticks.

Pediculosis Pubis

An infestation of the pubic hair and skin with pubic lice, leading to itching and redness.

Protozoan Infection

An infection caused by protozoa, which are single-celled microscopic organisms.