The correct option is (c) 1 and 3 only.
Explanation
Sunlight is polychromatic (white light), meaning it is a mixture of different colors (wavelengths). Certain optical phenomena can separate these constituent wavelengths, making the spectrum of colors visible. This separation confirms the composite nature of white light.Statement-wise Analysis
- Statement 1: Correct. Soap bubbles appear colorful due to Thin Film Interference. When sunlight hits the thin film of the bubble, light waves reflected from the outer and inner surfaces interfere. Depending on the film's thickness and the angle of view, different wavelengths (colors) interfere constructively, making the bubble appear colorful. This proves sunlight contains multiple colors.
- Statement 2: Incorrect. Light reflected from a Compact Disk (CD) typically appears as a colorful rainbow due to Diffraction (the tracks on the CD act as a diffraction grating). The statement claims the light appears monochromatic (single color). This is factually incorrect regarding sunlight; if the light appeared monochromatic, it would not indicate that sunlight is a mixture of different colors. The phenomenon that actually occurs (spectral colors) does indicate a mixture, but the statement describes it wrongly.
- Statement 3: Correct. A rainbow is the most direct natural evidence that sunlight is a mixture of colors. It is formed by the Dispersion, refraction, and total internal reflection of sunlight in water droplets, splitting white light into its constituent spectrum (VIBGYOR).