A compound microscope uses multiple lenses to magnify an image for an observer. It is made of two convex lenses: the first, the ocular lens, is close to the eye; the second is the objective lens. Compound microscopes are much larger, heavier and more expensive than simple microscopes because of the multiple lenses.

The correct answer is option A) 2.

Explanation:
A compound light microscope is a type of microscope that uses multiple lenses to magnify an object. It consists of two main lenses, the objective lens and the eyepiece lens.

1. Objective Lens:
The objective lens is located near the specimen or object being observed. It is responsible for gathering light and magnifying the image. The compound microscope typically has multiple objective lenses with different magnification powers (such as 4x, 10x, 40x, and 100x). Each objective lens has a different level of magnification, allowing the user to switch between them for different levels of detail.

2. Eyepiece Lens:
The eyepiece lens is located near the viewer's eye and is responsible for further magnifying the image produced by the objective lens. It typically has a fixed magnification power, such as 10x. The combination of the objective lens and the eyepiece lens results in the total magnification of the microscope.

3. Additional lenses:
While the compound light microscope has only two main lenses, there may be additional lenses present in the microscope, such as a condenser lens. The condenser lens is located beneath the stage and helps focus the light onto the specimen, improving the quality of the image.

However, when considering the number of lenses specifically in the compound light microscope, the question is referring to the objective lens and the eyepiece lens. These two lenses are the main components responsible for magnification and observation of the specimen. Hence, the correct answer is option A) 2.