Q28 of 117 Page 10

Find the position, nature and size of the image of an object 3 cm high place at a distance of 9 cm from a concave mirror of focal length 18 cm.


Given, height of object = + 3 cm
object distance(v) = 9 cm
focal length of concave mirror(f) = 18 cm
Using Mirror formula,
For concave mirror, f = -18 cm, u = 9 cm



Using Magnification equation,



Thus, the image will be real, inverted and larger than the object.

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Draw the ray diagram to show the formation of image by a concave mirror of focal length 15 cm for the following positions of object. (Diagrams may not be drawn to the scale.)

Indicate is placed at 30 cm from mirror.


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b. object is placed at 10 cm form the mirror.