Question

What fundamental concepts are demonstrated by Young's Double slit experiment
A. All light behaves as particle
B. Light exhibits wave like behaviour
C. The formation of bright and dark fringes through interference
D. Reflection of light from surface
E. Interference pattern produced using mono chromatic light

• A. B, C and E only
• B. A, B and D only
• C. A, C and D only
• D. B, C and D only

Hint:

Young's Double Slit experiment is the ultimate proof of light's \textbf{wave nature}. The key observation is the \textbf{interference pattern} (fringes), which is most clearly seen with \textbf{monochromatic} light.

Answer 1

The Correct Option is A

Young's Double Slit experiment is a cornerstone of physics that reveals the nature of light.
Step 1: Analyze the experiment. In the experiment, a single light source (monochromatic) is passed through two narrow, parallel slits. The light then lands on a screen behind the slits.

Step 2: Evaluate the outcomes and concepts.
A. All light behaves as particle: Incorrect. If light were only particles, two bright lines would appear on the screen directly behind the slits. The experiment's result contradicts this.
B. Light exhibits wave like behaviour: Correct. The resulting pattern of multiple bright and dark bands can only be explained if light behaves as a wave, with the waves from each slit interfering with each other.
C. The formation of bright and dark fringes through interference: Correct. This is the direct observation from the experiment. Bright fringes are constructive interference, and dark fringes are destructive interference.
D. Reflection of light from surface: Incorrect. The experiment demonstrates diffraction (bending of waves around the slits) and interference, not reflection.
E. Interference pattern produced using mono chromatic light: Correct. Using monochromatic light (light of a single wavelength) is crucial to get a clear, stable interference pattern.
Conclusion: The concepts demonstrated are B, C, and E.