At what distance in front of a concave mirrorof focal length 10 cm, an object be placed so that its virtual image of size five times that of the object is obtained?

Explanation

To solve the problem of finding the distance at which an object should be placed in front of a concave mirror to obtain a virtual image that is five times the size of the object, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values:**
- Focal length (F) of the concave mirror = -10 cm (negative because it is a concave mirror).
- Magnification (M) = 5 (positive because the image is virtual).

...