A concave mirror can be used to burn a piece of a paper by focusing reflected rays of the sun.

You must know that, when an image formed by plane mirror is always virtual and erect. It is laterally inverted i.e., the right side of the object appears left side of the image and vice versa.

(I) Na (II) Ca (III) Fe (IV) Cu

Metals like iron, aluminium, zinc do not react with hot/cold water. They react with water only when water is in the form of steam. 3Fe + 4H₂O → Fe₃O₄ +4H₂

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