To answer the question regarding the colors of light represented by rays a, b, and c as they travel from a rare medium (like air) to a dense medium (like glass or water), we need to understand the concept of refraction and how different colors of light behave when they pass through different media. ### Correct Option: A. red, green and blue ### Explanation of Why the Answer is Correct: 1. **Understanding Refraction**: - Refraction is the bending of light as it passes from one medium to another with a different density. When light enters a denser medium, it slows down and bends towards the normal (an imaginary line perpendicular to the surface at the point of incidence). - The amount of bending depends on the wavelength of the light. Shorter wavelengths (like blue light) bend more than longer wavelengths (like red light). 2. **Order of Colors**: - The visible spectrum of light consists of different colors, which can be remembered using the acronym ROYGBIV (Red, Orange, Yellow, Green, Blue, Indigo, Violet). - When white light (which contains all colors) enters a denser medium, the colors will refract at different angles. The order of bending from least to most is: red (least bending), green (medium bending), and blue (most bending). 3. **Analyzing the Rays**: - In the diagram, as the white light beam enters the dense medium, the rays a, b, and c represent different colors of light. - Since red light has the longest wavelength, it will bend the least and will be represented by ray a. - Green light, with a medium wavelength, will be represented by ray b. - Blue light, having the shortest wavelength, will bend the most and will be represented by ray c. ### Why the Other Options are Wrong: - **Option B: Green, red and blue**: This option incorrectly states the order of colors. Green should not be the first ray as it bends more than red. - **Option C: Yellow, blue and red**: This option is incorrect because yellow is not one of the rays represented in the scenario. Additionally, the order of bending is not correct. - **Option D: Blue, yellow and red**: This option also misrepresents the order of colors. Blue should be the last ray due to its higher bending, and yellow is not relevant in this context. ### Summary of Key Points: - **Refraction**: Light bends when it passes from a rare medium to a dense medium. - **Color Order**: Red bends the least, followed by green, and blue bends the most. - **Correct Identification**: Rays a, b, and c correspond to red, green, and blue respectively. - **Understanding Wavelengths**: Shorter wavelengths (blue) bend more than longer wavelengths (red). This understanding of light behavior is crucial for solving problems related to optics and refraction in physics.