The penumbra caused by an extended light source, as seen in this figure, results from what?
a. The superposition of images from point light sources spread throughout the region covered by the extended source.
b. The poorer quality light source in the right hand figure.
c. The image of the extended light source on the screen.
d. Scattered light from other nearby objects.
e. Light leaking into the room from outside sources.
a
You might also like to view...
Two blocks of mass m1 and m2 are connected by strings and pulled with constant acceleration a. What is the relationship between
A. T1 > T2 B. T1 < T2 C. T1 = T2 D. T1 = T2 = 0
The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is
A) 1000 N. B) 2000 N. C) 3000 N. D) 4000 N. E) 5000 N.
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours
The change in brightness alternates between a small change and a large change. The most likely explanation is that ________. A) the star is a member of an eclipsing binary star system B) the star is periodically ejecting gas into space, every 73 hours C) the star is a Cepheid variable D) the star is a white dwarf
An acceleration may result from
a. a change in speed. b. a change in direction. c. a change in both speed and direction. d. all of these