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Question 3

Match the items given in Column I with one or more items of Column II.

Column I                                          Column II
(a) A plane mirror                              (i) Used as a magnifying glass.
(b) A convex mirror                           (ii) Can form image of objects spread over a large area.
(c) A convex lens                              (iii) Used by dentists to see enlarged image of teeth.
(d) A concave mirror                         (iv) The image is always inverted and magnified.                                                                                                                    (e) A concave lens                            (v) The image is erect and of the same size as the object.
                                                         (vi) The image is erect and smaller in size than the object.

Answer

Column I                                          Column II

(a) A plane mirror                              (v) The image is erect and of the same size as the object.
(b) A convex mirror                            (ii) Can form image of objects spreads over a large area.
(c) A convex lens                               (i) Used as a magnifying glass.
(d) A concave mirror                          (iii) Used by dentists to see enlarged image of teeth.
(e) A concave lens                             (vi) The image is erect and smaller in size than the object.

1. A plane mirror: A plane mirror have a flat reflective surface. The angle of reflection is always equals to the angle of incidence for the light rays which strikes the plane mirror. The angle formed by the incident ray and surface of normal is called the angle of incidence. 

2. A convex mirror: A convex mirror is a diverging mirror in which the reflective surface bulges towards the light Source. The image formed by convex mirrors are smaller than the object but gets larger as they approach.



3. Concave mirror: A concave mirror has a reflective surface that is curved inwards and away from the light source. Concave mirrors are widely used in headlights of auto mobiles motor vehicles, torch lights etc.

4. Convex lens: The convex lens is a lens that converges rays of light that convey parallel to its principal axis which is relatively thick cross the middle and thin at the lower and upper edges. A convex lense in thinner in the middle and thicker towards the edges.

5. Concave lens: A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its edges, and is used to correct short sightedness.

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