Option 1 suggests that both statements are true, and Statement II is the correct explanation of Statement I.

To understand the validity of this option, let`s dissect each statement individually.

Statement I states that a convex mirror is used as a driver mirror. This is true because convex mirrors are commonly used as side mirrors for vehicles. These mirrors provide a wider field of view, which is crucial for drivers to see objects and vehicles approaching from the sides.

Statement II states that images formed by convex mirrors are diminished in size. This statement is also true. Convex mirrors cause the light rays to diverge, resulting in a smaller, virtual image. This reduction in size is why objects in convex mirrors appear smaller than their actual size.

However, the two statements are not directly related to each other. The fact that convex mirrors are used as driver mirrors does not necessarily mean that the diminished size of the images is the reason behind their use. Therefore, Option 1 is incorrect.

The correct answer is Option 2, which states that both statements are individually true, but Statement II is not the correct explanation of Statement I.