Q. 28

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.

Answer :


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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