A convex lens of focal length `25 cm` is placed co-axially in contact with a concave lens of focal length `20 cm`. Determine the power of the combination. Will the system be converging or diverging in nature ?

Explanation

To solve the problem, we need to find the power of the combination of a convex lens and a concave lens placed in contact with each other. Let's break down the steps:

### Step 1: Identify the Focal Lengths
- The focal length of the convex lens (f₁) is given as 25 cm.
- The focal length of the concave lens (f₂) is given as -20 cm (negative because it is a concave lens).

### Step 2: Convert Focal Lengths to Meters
- Convert f₁ to meters:
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