Choose the following statement a True of False.
a. The real image formed by a lens is always inverted.
b. The image formed by a lens is always inverted.
c. The image formed by a concave lens is always erect and diminished.
d. An air bubble inside water acts like a concave lens.
e. The distance between a real object and its real image formed by a single lens cannot be more than 4f.
f. I an object is moved at a constant speed toward a convex lens from infinity to focus, then its image moves slower in the begninning and faster later on, away from the lens.
g. The focal length of a glass `(mu=1.5)` lens is 10 cm in air. When it is completely immersed in water its focal length will become 40cm.

Explanation

To solve the question, we will analyze each statement one by one and determine whether they are true or false based on the principles of geometrical optics.

### Step-by-Step Solution:

1. **Statement a**: "The real image formed by a lens is always inverted."
- **Analysis**: Real images formed by a lens are indeed inverted. This is because real images are formed on the opposite side of the lens from the object and can be projected onto a screen.
- **Conclusion**: **True**

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