A concave - convex lens has faces of radii 4 cm and 3 cm respectively and is made of glass of refractive index 1.6. Determine
position of image when object is placed at 28 cm in front of the lens

Explanation

To solve the problem of determining the position of the image formed by a concave-convex lens, we will follow these steps:

### Step 1: Identify the given parameters
- Radius of curvature of the first surface (convex side), \( R_1 = 3 \, \text{cm} \)
- Radius of curvature of the second surface (concave side), \( R_2 = -4 \, \text{cm} \) (negative because it is concave)
- Refractive index of the lens material, \( \mu = 1.6 \)
- Object distance, \( u = -28 \, \text{cm} \) (negative as per sign convention)

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