The Milky Way's companion galaxies, the Magellanic Clouds, are irregular galaxies
Indicate whether the statement is true or false
TRUE
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Plane polarized light of intensity 
is passed through two polarizers, the first one at 45 
more so that it is perpendicular to the original plane of polarization. What intensity is transmitted?
A. 0.50 
B. 0.35
C. 0.25
D. 0.13
E. 0
Appliances with three-pronged plugs compared to those with two-prong plugs are
1.safer to use and connected to ground. 2.no safer to use and ungrounded. 3.more dangerous to use and connected to ground. 4.safer to use and ungrounded.
The interior layer just below the crust of Earth is called the ________.
A. inner core B. mantle C. troposphere D. outer core
A beam of light in air is incident at an angle of 46° to the surface of a rectangular block of clear plastic (n = 1.46). The light beam first passes through the block and re-emerges from the opposite side into air at what angle to the normal to that surface?
a. 23° c. 46° b. 59° d. 30°