Where will the image of a distant object be formed when a person using a concave lens to correct vision, is not using glasses?

The correct option is in front of the retina.

To understand why this is the case, let us break down how vision works in this scenario step-by-step:
1. Identifying the Vision Defect: A person who requires a concave lens to correct their vision suffers from myopia, which is commonly known as nearsightedness.
2. Understanding Myopia: In a myopic eye, the parallel light rays coming from a distant object are focused too close to the front of the eye. This happens either because the eyeball is elongated (too long from front to back) or the eye's crystalline lens has excessive converging power.
3. Image Formation Without Correction: When this person is not wearing their corrective glasses (which contain the concave lens), the light rays from a distant object converge too quickly. As a result, the image is formed and focused in front of the retina rather than directly on it, causing the distant object to appear blurry.
4. Role of the Concave Lens: A concave lens is a diverging lens. When worn, it diverges the incoming parallel light rays before they enter the eye. This divergence compensates for the eye's over-refraction, moving the focal point further back so that the image is formed precisely on the retina for clear vision.