A dentine variety of maater all samples of which have same properties Give one word answers
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A spherical mirror is a mirror which has the shape of a piece cut out of a spherical surface. There are two types of spherical mirrors: concave, and convex. These are illustrated in Fig. 68. ... The point at which the principal axis touches the surface of the mirror is called the vertex.
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This tilt is the reason that days are longer in the summer and shorter in the winter. The hemisphere that's tilted closest to the Sun has the longest, brightest daysbecause it gets more direct light from the Sun's rays. One hemisphere doesn't stay tilted closer to the Sun all year
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