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When light is incident on a diffraction ...

When light is incident on a diffraction grating, the zero order principal maximum will be

A

One of the component colour

B

Absent

C

Spectrum of the colours

D

White

Text Solution

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The correct Answer is:
To solve the question regarding the zero order principal maximum when light is incident on a diffraction grating, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Diffraction Grating**: A diffraction grating consists of multiple slits that disperse light into its component colors (spectrum) due to interference. When light passes through these slits, it creates a pattern of bright and dark spots on a screen. 2. **Identifying the Principal Maximum**: The principal maxima are the bright spots observed on the screen. The central maximum is referred to as the zero order maximum, which is located directly in line with the incoming light. 3. **Path Difference and Phase Difference**: For the zero order maximum, the path difference between the light waves coming from adjacent slits is zero. This means that the light waves arrive at the screen in phase, leading to constructive interference. 4. **Color of the Central Maximum**: Since all colors of light (from the visible spectrum) constructively interfere at the zero order maximum, the result is a combination of all colors. This combination appears as white light. 5. **Conclusion**: Therefore, the zero order principal maximum will be white light, as it results from the constructive interference of all wavelengths of visible light. ### Final Answer: The zero order principal maximum will be white light. ---
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