### Correct Option: B. Real and inverted ### Detailed Explanation: When a parallel beam of light strikes a concave mirror, the behavior of the light rays can be analyzed using the principles of reflection and the properties of concave mirrors. 1. **Understanding Concave Mirrors**: - A concave mirror is a spherical mirror that curves inward, resembling a portion of a sphere. It has a focal point (F) where parallel rays of light converge after reflecting off the mirror. - The focal point is located in front of the mirror, and the distance from the mirror's surface to the focal point is known as the focal length (f). 2. **Behavior of Parallel Light Rays**: - When parallel rays of light (like those from a distant object) strike a concave mirror, they reflect off the mirror's surface. - According to the law of reflection, the angle of incidence equals the angle of reflection. For parallel rays, the angle of incidence is the same for all rays. 3. **Convergence at the Focal Point**: - After reflecting off the concave mirror, these parallel rays converge at the focal point. This is a key characteristic of concave mirrors: they can focus parallel light rays to a single point. - The image formed at the focal point is a result of these rays converging. 4. **Type of Image Formed**: - The image formed at the focal point of a concave mirror is real because the light rays actually converge at that point. A real image can be projected onto a screen. - The image is inverted because the light rays that converge at the focal point come from an object that is above the principal axis (the horizontal line that runs through the center of the mirror). When these rays converge, they cross over, resulting in an image that is upside down. ### Why Other Options Are Incorrect: - **Option A: Virtual and upright**: - A virtual image is formed when the light rays do not actually converge but appear to diverge from a point behind the mirror. This occurs with convex mirrors or when the object is placed between the focal point and the mirror. Since we are discussing a concave mirror with parallel rays, this option is incorrect. - **Option C: Real and upright**: - A real image cannot be upright when formed by a concave mirror from parallel rays. Real images are always inverted due to the nature of how light converges. Thus, this option is also incorrect. - **Option D: Virtual and inverted**: - A virtual image cannot be inverted. Virtual images are always upright and formed when the object is within the focal length of the mirror. Since we are dealing with parallel rays striking a concave mirror, this option is incorrect. ### Summary of Key Points: - A concave mirror focuses parallel light rays to a point known as the focal point. - The image formed at the focal point is real because the light rays converge there. - The image is inverted due to the crossing of light rays after reflection. - The correct answer is B: Real and inverted. This understanding of concave mirrors and the behavior of light is crucial for solving problems related to optics in physics.