A square-shaped planar object of edge length 3 cm is placed at a distance 30 cm from a concave mirror. Focal length of the concave mirror is 12 cm. Find area enclosed by image. Centre of the square lies on principal axis and plane of the square is perpendicular to the principal axis.

Explanation

To solve the problem step by step, we will follow these steps:

### Step 1: Identify the given values
- Edge length of the square object (l) = 3 cm
- Distance of the object from the mirror (u) = -30 cm (negative because it is in front of the mirror)
- Focal length of the concave mirror (f) = -12 cm (negative for concave mirrors)

### Step 2: Use the mirror formula to find the image distance (v)
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