A converging lens has a focal length of 40 cm . Calculate the size of the real image of an object, 4.0 cm in height, for the object distance:
50 cm
Given `f = 40 cm, h _(0) = 4 cm, and u` in different cases. Find: `h _(1)` in each case corresponding to the given value of u.

Explanation

To solve the problem of finding the size of the real image formed by a converging lens, we will use the lens formula and the magnification formula. Here are the steps to derive the solution:

### Given Data:
- Focal length of the lens, \( f = 40 \, \text{cm} \)
- Height of the object, \( h_0 = 4 \, \text{cm} \)
- Object distance, \( u = -50 \, \text{cm} \) (negative as per convention)

### Step 1: Use the Lens Formula
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