The Eye Focuses by

question 38

Multiple Choice

The eye focuses by

• A) moving the lens.
• B) moving the retina.
• C) moving both the lens and the retina.
• D) changing the focal length of the lens.
• E) changing the index of refraction of the vitreous fluid.

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Definitions:

Natural Gas

A fossil fuel consisting primarily of methane, used as an energy source for heating, cooking, and electricity generation.

Methane

A colorless, odorless flammable gas that is the simplest alkane and a major component of natural gas, contributing significantly to the greenhouse effect.

Net Useful Energy Yield

The amount of energy that remains available for use after subtracting the energy expended in obtaining and converting it.

Oil

A fossil fuel formed from the decayed remains of ancient organisms, used primarily for energy production and as a raw material in manufacturing.