When light goes through two or more separated lenses,
a. the image distance of the first lens (the one nearest the object) will be positive.
b. the final image can be inverted.
c. the image distance of the first lens will be the object distance for the second lens.
d. the object distance for the second lens will be negative.
b
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How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth. B) With larger and more elegant sighting instruments. C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) With the recently-invented telescope. E) With a new type of telescope that used mirrors instead of lenses.
A bullet is fired horizontally at a target 20 m away. The velocity of the bullet as it leaves the gun is 200 m/s. How much, approximately, will the bullet drop on its way to the target?
A. 0.4 m B. 0.3 m C. 0.2 m D. 0.05 m E. 0.1 m
The Hubble Telescope gets much clearer images of astronomical objects than ground-based telescopes because it has a much larger mirror than ground-based telescopes.
Answer the following statement true (T) or false (F)
A lunar eclipse can only happen when the moon is ________ (what moon phase).
Fill in the blank(s) with the appropriate word(s).