What are most fossils discovered in
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The rays of light coming from the Sun are parallel to each other, so when they are reflected by the concave piece of glass (which acts as a concave mirror) they converge into the focus of the mirror, which is
The radius of curvature of a concave mirror is twice its focal length, so in this case it is:
The radius of curvature of a concave mirror is twice its focal length, so in this case it is: