In double slit experiment we observe _____________________?
Correct answer: C. both interference and diffraction fringes
- A. interference fringes only
- B. diffraction fringes only
- C. both interference and diffraction fringes
- D. polirized frringes
Explanation
In a real double-slit arrangement, each slit diffracts the light and the waves from the two slits interfere, so interference fringes appear within a diffraction envelope. Option a is often selected because the visible fine fringes are called interference fringes, while the diffraction effect is sometimes overlooked.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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