A lens of focal length 40 mm is used as a magnifier. The object being viewed is 5.3 mm long, and is positioned at the focal point of the lens. The user of the magnifier has a near point at 25 cm
The angular magnification of the magnifier is closest to: A) 6.3
B) 5.6
C) 6.9
D) 7.5
E) 8.1
A
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In the summer in the northern hemisphere,
a. the Earth is closer to the Sun. b. the Earth's northern hemisphere is tilted toward the Sun. c. the Earth's northern hemisphere is tilted away from the Sun.
The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole
Fill in the blank(s) with correct word
What is stellar parallax?
A) It is the daily rise and set of the stars. B) It describes the fact that stars are actually moving relative to one another, even though to our eyes the stars appear fixed in the constellations. C) It is the slight back-and-forth shifting of star positions that occurs as we view the stars from different positions in Earth's orbit of the Sun. D) It is the change in the set of constellations that we see at different times of year in the evening sky.
The height of the ceiling in a typical home, apartment, or dorm room is closest to
A) 100 cm. B) 200 cm. C) 400 cm. D) 500 cm.