The Angular Magnification of a Refracting Telescope Is 40 X

question 25

Multiple Choice

The angular magnification of a refracting telescope is 40 x.When the object and final image are both at infinity,the distance between the eyepiece and the objective is 143.5 cm.The telescope is used to view a distant radio tower.The real image of the tower,formed by the objective,is 6.0 mm in height.The focal point of the eyepiece is positioned at the real image.What is the focal length of the objective lens?

• A) 137 cm
• B) 138 cm
• C) 139 cm
• D) 140 cm
• E) 141 cm

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Definitions:

Alpha-Fetoprotein

A protein produced by the liver of a developing fetus, levels of which are tested during pregnancy as a marker for certain conditions.

Neural Tube Defect Screening

A test on a pregnant woman’s blood during the second trimester to measure the level of alpha-fetoprotein; test results reveal possible defects of the spine, spinal cord, skull, and brain.

Amniocentesis

A medical procedure used in prenatal diagnosis to extract amniotic fluid using a needle for genetic and chromosomal testing.

Fetal Abnormalities

Conditions that deviate from the normal development of a fetus, which can be structural, functional, or genetic.