name the lens used to locate the specimen

needs to be 17 letters
can be compound

To answer this question and also help you understand how to arrive at the answer, let's break it down step by step.

Step 1: Identifying the type of lens used to locate a specimen
When locating a specimen, a compound microscope is typically used. Compound microscopes have an objective lens and an ocular lens (also known as the eyepiece). The objective lens is responsible for the initial magnification and locating the specimen, while the ocular lens further magnifies the image for viewing.

Step 2: Determining the number of letters needed in the lens's name
We are looking for a lens with 17 letters in its name.

Step 3: Naming the lens
There are several types of objective lenses commonly used in compound microscopes, such as the low power objective lens (also known as the scanning lens), the high power objective lens, and the oil immersion objective lens.

However, none of these lens names have precisely 17 letters. Therefore, it is likely that the question might be asking for an alternative, less common compound microscope lens. Since there is no widely recognized 17-letter lens name that fits within the standard types, it is advisable to refer to the specific microscope manufacturer's documentation or consult an expert in microscopy for any specialized lenses with such a name.

In summary, the lens used to locate a specimen in a compound microscope typically falls under the category of objective lenses, such as the low power objective lens, high power objective lens, or oil immersion objective lens. However, if you are looking for a lens name with exactly 17 letters, it may refer to a less common or specialized lens that would require additional research or consultation with experts.