A simple magnifier of refractive power 15.0 D is used to observe a beetle on a student’s desk. If the image of the beetle is formed at her nearpoint of 25 cm, how large is the image compared to the beetle?
A. 4.0
B. 2.0
C. 5.9
D. 1.5
E. 0.50
C. 5.9
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Few ________ actually strike the Earth, because most are small and burn up in the atmosphere
Fill in the blank(s) with correct word
Why does the Earth's atmosphere contain much more nitrogen than hydrogen?
What will be an ideal response?
Compared to the amount of current that flows from a battery and into a circuit, the amount of current that returns to the battery is
A) less. B) the same. C) greater. D) dependent on the internal resistance of the battery.
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity
What is the direction of the electric field? A) along the -y-axis B) along the +y-axis C) along the -x-axis D) along the +x-axis E) along the -z-axis