9.Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?

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Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to $\frac{1}{3} r d$ of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?

6. a.An object 4 cm in size is placed at a distance of 25 cm from a concave mirror of focal
length 15 cm. Find the position, nature and height of the image.
b A converging mirror forms a real image of height 4 cm, of an object of height 1 cm
placed 20 cm away from the mirror. Calculate the image distance. What is the focal
length of the mirror?

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to size of the object.

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