Consider the following statements about white light: 1. Sunlight is referred to as monochromatic light. 2. White light consists of seven colors. 3. A prism can be used to split white light into its constituent colors. Which of the statements given above are correct?

The correct option is (c). Explanation White light is a form of polychromatic light, meaning it is composed of multiple wavelengths across the visible spectrum. The separation of visible light into its different colors is known as dispersion. - Statement 1 is Incorrect: The term "monochromatic" (mono = single, chroma = color) refers to light consisting of a single wavelength or frequency. Sunlight is polychromatic because it contains a mixture of all visible wavelengths. - Statement 2 is Correct: White light is a combination of seven primary spectral colors: Violet, Indigo, Blue, Green, Yellow, Orange, and Red (VIBGYOR). This composite nature was famously demonstrated by Isaac Newton. - Statement 3 is Correct: A prism splits white light into its constituent colors through the process of dispersion. This occurs because the refractive index of the glass prism varies for different wavelengths; violet light (shorter wavelength) bends the most, while red light (longer wavelength) bends the least. Key Takeaway: White light is not monochromatic but a mixture of seven colors. Dispersion occurs in a prism because different colors travel at different speeds within the medium, causing them to refract at different angles.

Consider the following statements about white… - NCERT Class 7 Science MCQ

NCERT Class 7 Science — Chapter 2: Light

mcqeasy

Consider the following statements about white light:

Sunlight is referred to as monochromatic light.
White light consists of seven colors.
A prism can be used to split white light into its constituent colors.

Which of the statements given above are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 136

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2, and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

White light is a form of polychromatic light, meaning it is composed of multiple wavelengths across the visible spectrum. The separation of visible light into its different colors is known as dispersion.

Statement 1 is Incorrect: The term "monochromatic" (mono = single, chroma = color) refers to light consisting of a single wavelength or frequency. Sunlight is polychromatic because it contains a mixture of all visible wavelengths.
Statement 2 is Correct: White light is a combination of seven primary spectral colors: Violet, Indigo, Blue, Green, Yellow, Orange, and Red (VIBGYOR). This composite nature was famously demonstrated by Isaac Newton.
Statement 3 is Correct: A prism splits white light into its constituent colors through the process of dispersion. This occurs because the refractive index of the glass prism varies for different wavelengths; violet light (shorter wavelength) bends the most, while red light (longer wavelength) bends the least.

Key Takeaway: White light is not monochromatic but a mixture of seven colors. Dispersion occurs in a prism because different colors travel at different speeds within the medium, causing them to refract at different angles.

Your note

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