Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration
This effect helps us to understand why A) we become more farsighted as we grow older.
B) we become more nearsighted as we grow older.
C) we can see only in black and white in dim light.
D) it is easier to read in bright light than in dim light.
E) a moving object is more readily detected than a stationary one.
D
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In a Hertzsprung-Russell (H-R) diagram, points near the top of the diagram represent very low luminosity stars and points near the bottom represent very luminous stars
Indicate whether the statement is true or false
Tycho failed to detect ______ for the nova of 1572 indicating it was ______
a. parallax; beyond the orbit of Earth's Moon b. parallax; inside the Earth's atmosphere close to Earth c. light; beyond the orbit of Earth's Moon d. light; inside the Earth's atmosphere close to Earth
A string is wound tightly around a fixed pulley whose radius is 5.0 cm. As the string is pulled, the pulley rotates without slipping. What is the angular speed of the pulley when the string has a linear speed of 5.0 m/s?
A) 100 rad/s B) 50 rad/s C) 25 rad/s D) 20 rad/s E) 10 rad/s
What is the difference between parallel and counter flow?
What will be an ideal response?