In Young's interference experiment, the central bright fringe can be indentified due to the fact that it

Options

A. has greater intensity than other fringes which are bright
B. is wider than the other bright fringes
C. is narrower than the other bright fringes
D. can be obtained by using white light instead of monochromatic light

Explanation

To solve the question regarding the identification of the central bright fringe in Young's interference experiment, we can analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Central Bright Fringe**:
In Young's double-slit experiment, the central bright fringe (also known as the zeroth-order maximum) occurs where the path difference between the light waves from the two slits is zero. This is the point where constructive interference occurs.

**Hint**: Recall that constructive interference happens when the path difference between two waves is an integer multiple of the wavelength.

2. **Evaluating Option A**:
The first option states that the central bright fringe has greater intensity than other bright fringes. This option is incorrect because the intensity of all bright fringes is determined by the amplitude of the light waves from the slits, which is the same for all maxima.

**Hint**: Think about how intensity is related to the amplitude of the waves and how it behaves in interference patterns.

3. **Evaluating Option B**:
The second option claims that the central bright fringe is wider than other bright fringes. This is also incorrect. The width of the fringes is determined by the slit separation and the wavelength of light, and all bright fringes have the same width in a uniform setup.

**Hint**: Consider the formula for fringe width and how it applies to all bright fringes.

4. **Evaluating Option C**:
The third option states that the central bright fringe is narrower than other bright fringes. This is incorrect as well, for the same reason as option B. The fringe width remains constant across all bright fringes.

**Hint**: Reflect on the uniformity of fringe spacing in Young's experiment.

5. **Evaluating Option D**:
The fourth option suggests that the central bright fringe can be obtained by using white light instead of monochromatic light. This option is correct. When white light is used, the central maximum appears white due to the superposition of all colors, while other fringes display a spectrum of colors due to different wavelengths interfering at different positions.

**Hint**: Remember how white light consists of multiple wavelengths and how this affects the interference pattern.

### Conclusion:
The correct answer is that the central bright fringe can be identified because it can be obtained by using white light instead of monochromatic light. The other options are incorrect as they misrepresent the properties of the interference pattern.