An object 15 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image height (in cm)?
A. 2
B. 4
C. 6
D. 8
E. 30
Answer: C
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When you stand at rest on a pair of bathroom scales, the reading on each scale
A) is half your weight. B) equals your weight. C) add up to equal your weight.
If the merger theory is correct, the brightest active galactic nuclei should
A) form small irregular galaxies. B) contain supermassive black holes. C) contain the least mass. D) contain the youngest stars. E) be in the smallest elliptical galaxies.
A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?
A) 3.9 cm B) 4.2 cm C) 6.3 cm D) 2.1 cm E) 8.5 cm
Reflecting telescopes may suffer with what kind of aberration(s)?
A. spherical B. chromatic C. spherical and chromatic D. cinematic E. Brewster and parabolic