Importance of Refraction in Vision:
Refraction plays a crucial role in vision as it helps in the formation of images on the retina. When light enters the eye, it undergoes refraction at the cornea and lens, which helps in focusing the light onto the retina. This process is essential for clear vision.

Relationship between Objects and Light Rays:
- Light rays travel in straight lines until they encounter a boundary between two different mediums, such as air and glass.
- When light passes from one medium to another, such as from air to the cornea of the eye, it changes speed and direction, causing refraction.
- The shape and structure of an object determine how light rays interact with it. For example, a smooth surface will reflect light differently than a rough surface.
- The interaction between objects and light rays determines how we perceive and see objects in our environment.

Role of Particles and Light Rays:
- Objects are made up of particles that interact with light rays by absorbing, reflecting, or transmitting them.
- The color of an object is determined by the wavelengths of light that are absorbed and reflected by its particles.
- The size and shape of particles in an object can affect how light is scattered and refracted, influencing how we see the object.
- The interaction between particles and light rays is fundamental to the process of vision and how we perceive the world around us.
In conclusion, the relationship between objects, particles, and light rays is intricate and essential for understanding how we see and perceive the world. Refraction plays a crucial role in vision by helping in the formation of clear images on the retina, highlighting the significance of understanding the interaction between objects and light rays.