A spherical mirror
A. is shaped like a complete sphere.
B. is a section of a sphere.
C. creates only spherical images.
D. only reflects spherical rays.
Ans: B. is a section of a sphere.
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If the Moon is relatively far from Earth, so that its umbra does not reach Earth, someone directly behind the umbra will see
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For the following balanced reaction, which of the following is a gas?
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