We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

Explanation

To solve the problem of obtaining an erect image using a concave mirror with a focal length of 15 cm, we can follow these steps:

### Step 1: Understand the properties of a concave mirror
A concave mirror can produce both real and virtual images. A real image is formed when the object is placed outside the focal point (f), while a virtual image is formed when the object is placed between the focal point and the mirror.

### Step 2: Determine the focal length
The focal length (f) of the concave mirror is given as 15 cm.

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