### Correct Option: B. To magnify images ### Detailed Explanation: A convex lens, also known as a converging lens, is a transparent optical device that is thicker in the center than at the edges. Its primary function is to bend (refract) light rays that pass through it in such a way that they converge to a point. This property is what allows convex lenses to magnify images. #### How Convex Lenses Work: 1. **Refraction of Light**: When light rays enter a convex lens, they slow down and change direction due to the lens's curvature and the difference in the refractive index between air and the lens material (usually glass or plastic). This bending of light is called refraction. 2. **Focal Point**: The point where the refracted light rays converge is called the focal point. The distance from the center of the lens to the focal point is known as the focal length. For a convex lens, the focal point is located on the opposite side of the lens from where the light enters. 3. **Image Formation**: Depending on the position of the object relative to the lens, a convex lens can produce different types of images: - **Real and Inverted Images**: When the object is placed outside the focal length, the lens produces a real image that can be projected onto a screen. This image is inverted (upside down) and can be larger than the object, thus magnifying it. - **Virtual and Upright Images**: When the object is placed within the focal length, the lens produces a virtual image that cannot be projected onto a screen. This image is upright and larger than the object, which is also a form of magnification. 4. **Applications**: Convex lenses are widely used in various optical instruments such as: - **Cameras**: To focus light and create clear images. - **Magnifying Glasses**: To enlarge small objects for better visibility. - **Microscopes**: To magnify tiny specimens for detailed observation. - **Telescopes**: To gather and magnify distant celestial objects. ### Why Other Options Are Incorrect: - **A. To scatter light rays**: This option is incorrect because convex lenses do not scatter light; instead, they focus or converge light rays. Scattering typically occurs with materials that have rough surfaces or are made of certain types of particles, not with smooth, transparent lenses. - **C. To absorb light**: Convex lenses are designed to transmit light rather than absorb it. While some light may be absorbed due to imperfections or impurities in the lens material, the primary function of a convex lens is to refract and focus light, not to absorb it. - **D. To reflect light**: Convex lenses do not reflect light; they refract it. Reflection occurs on the surface of mirrors or reflective materials, while lenses are primarily used to bend light through refraction. ### Summary of Key Points: - A convex lens is thicker in the center and converges light rays to a focal point. - Its primary function is to magnify images, producing both real and virtual images depending on the object's position. - Convex lenses are essential in various optical devices, enhancing our ability to see and capture images clearly. - Understanding the properties of convex lenses is crucial for applications in photography, microscopy, and astronomy. This thorough understanding of convex lenses will help you grasp their significance in optics and prepare effectively for your exams.