YDSE: Fringe Width & Fringe Positions
This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement-1: In Young's double slit experiment, the number of fringes observed in the field of view is small with longer wavelength of light and is large with shorter wavelength of light. Statement-2: In the double slit experiment the fringe width depends directly on the wavelength of light.
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Answer: (a)
- Fringe width , so : Statement-2 is true.
- Number of fringes in a fixed field of view , so longer gives fewer fringes: Statement-1 is true.
- Statement-1 follows directly from Statement-2.
- So the answer is (a).