Answer:
power is the rate at which energy is transferred or converted
the unit of power is Watts
The reflected beam of light passes through the focal point of the mirror.
In fact, a ray travelling parallel to the principal axis of a concave mirror passes through the focal point after it is reflected back from the mirror. This can be seen for instance in this figure:
http://www.cyberphysics.co.uk/graphics/diagrams/light/mirrors/concave_ray1.gif
where the situation described by the problem is shown with the red ray: the beam travels parallel to the principal axis and it is reflected through the focal point.
In 1784, Benjamin Franklin made what may have been the first connection between volcanoes and global climate while stationed in Paris as the first diplomatic representative of the United States of America. He observed that during the summer of 1783, the climate was abnormally cold, both in Europe and back in the U.S. The ground froze early, the first snow stayed on the ground without melting, the winter was more severe than usual, and there seemed to be "a constant fog over all Europe, and [a] great part of North America."
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There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid. For water, the temperature needs to be a little over zero degrees Celsius (0oC) for you to melt.
Electric current is the movement of the electrons caused by potential
difference. For example, in a circuit, the electrons in the bulb will not move
without the potential difference or voltage. When there is voltage, electric
current occurs because there is a driving force for the electrons in the wire
to move.