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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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%
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.
The ________ hypothesis was considered plausible in the 1800s, but is it no longer taken seriously
Fill in the blank(s) with correct word
Sediments convert to rock when they undergo
A) compaction and cementation. B) lithification. C) both A and B.