3. State (a) the melting point of ice and (b) the boiling point of water.
4. Why does the size of naphthalene balls decrease when left open?
5. State two uses of a convex mirror.
6. Why does a swimming pool look shallower than it really is when seen by a person standing outside
near it?
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Explanation:
︎︎︎ (a) melting point of ice is 0°c.
(b) Boiling point of water is 100°c.
︎︎︎ Size of naphthalene balls decreases when it is kept in room temperature. This process is called "Sublimation".
︎︎︎ (1) Convex mirror is used in preparation of eye lenses.
(2) It is also used in preparation of binoculars.
︎︎︎ Swimming pool looks shallower when we see it from outside.
Because, it is called appearent depth. Image of the surface of pool
forms at up then actual depth.
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