An object is placed at a distance of 80 cm from a screen. Where should a convex lens of focal length of 15 cm will be placed so as to obtain a real image of an object?

Explanation

To solve the problem of where to place a convex lens of focal length 15 cm to obtain a real image on a screen that is 80 cm away, we can follow these steps:

### Step 1: Understand the Problem
We have an object and a screen, with the distance between them being 80 cm. We need to find the position of the convex lens that will create a real image of the object.

### Step 2: Define Variables
Let:
- \( D \) = distance between the object and the screen = 80 cm
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