Correct spelling, explanation: the word lens is correct. This version is the standard and accepted spelling of the word in English. It refers to a piece of curved transparent material, usually glass, that is used to bend or focus light in optical devices such as cameras, microscopes, telescopes, and eyeglasses. The word lens has been in use for centuries, and its spelling has been established through the historical development of the English language. It comes from Latin and Old English origins, and over time, its spelling and pronunciation have become standardized as lens. On the other hand, lense is incorrect.

Definition of lens:
noun, a piece of glass or plastic having a curved surface in order to change the images that are received after going through it, usually to make them larger, smaller, or clearer
The photographer carefully cleaned the camera lens before capturing the stunning landscape.
The scientist used a powerful microscope lens to examine the intricate details of the specimen at a microscopic level.

Collocations with lens:
Some most commonly used collocations include:
1. Camera lens: the piece of glass or other transparent material that focuses light onto the camera’s image sensor, allowing the camera to capture images.
She changed the camera lens to capture a wider view of the city skyline.
2. Contact lens: a thin, curved lens placed directly on the eye’s surface to correct vision.
She prefers wearing contact lenses instead of eyeglasses for better comfort and convenience.
3. Magnifying lens: a convex lens that magnifies objects when placed close to them, often used in magnifying glasses and some types of microscopes.
The detective used a magnifying lens to examine the tiny details on the mysterious note.
4. Telephoto lens: a type of camera lens that allows photographers to capture distant subjects with greater detail.
With his telephoto lens, the wildlife photographer captured stunning shots of birds in flight from a distance.

Incorrect spelling, explanation: the spelling lense is a common misspelling of the word lens. English spelling can sometimes be tricky, and certain words may appear as if they should follow a certain pattern based on pronunciation, but they actually follow different rules due to their etymology or historical development. In the case of lens, the correct spelling has been standardized over time through the evolution of the English language. The word lens has its origins in Latin and Old English, and its spelling was established as lens for the singular form and lenses for the plural form.