Vision Problems: What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?
A. -2.5 diopters
B. -0.50 diopters
C. +4.0 diopters
D. +2.5 diopters
E. -50 diopters
Answer: A
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What happens after the helium flash in the core of a star?
A) The core quickly heats up and expands as helium fusion begins all at once throughout the core. B) The star breaks apart in a violent explosion. C) The core suddenly contracts because the helium disappears after being fused. D) The core stops fusing helium. E) The star starts to fuse helium in a shell outside the core.
Sediments convert to rock when they undergo
A) compaction and cementation. B) lithification. C) both A and B.
The ________ hypothesis was considered plausible in the 1800s, but is it no longer taken seriously
Fill in the blank(s) with correct word
Polarization: Unpolarized light passes through three ideal polarizing filters. The first filter is oriented with a horizontal transmission axis, the second one has its transmission axis at 30° from the horizontal, and the third filter has a vertical transmission axis. What percent of the light gets through this combination?
A. 9.4% B. 91% C. 50% D. 0% E. 33%