Question

an object is placed in front of a concave mirror an image half its size is formed at 15cm find object distance and focal length

Answer 1

Answer:

Hence, to obtain an erect image of an object from a concave mirror of focal length 15 cm, the object must be placed anywhere between the pole and the focus. The image formed will be virtual, erect, and magnified in nature, as shown in the given figure.

Explanation:

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Answer 2

For a concave mirror, image size is same as the object size when it is placed at the center of curvature. Since radius of the mirror is twice the focal length, center of curvature lies at a distance of 30 cm from the pole. Hence, an object kept at 30 cm will produce an image of the same size as that of the object.

Object is placed between. infinity and device, image formed is diminished and between pole and focus, behind it.