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Physics · 2023 · 4 marks
CBSE 2023 · Region 3 · Set 1 · Q35
Diffraction of light is bending of light around the corners of an object whose size is comparable with the wavelength of light. Diffraction actually…
Diffraction of light is bending of light around the corners of an object whose size is comparable with the wavelength of light. Diffraction actually defines the limits of ray optics. This limit for optical instruments is set by the wavelength of light. An experimental arrangement is set up to observe the diffraction pattern due to a single slit. Answer the following questions based on the above :
(a)
How will the width of central maximum be affected if the wavelength of light is increased?
(b)
Under what condition is the first minimum obtained ?
(c)
Write two points of difference between interference and diffraction patterns.
OR
(c)
Two students are separated by a $\displaystyle 7$ m partition wall in a room $\displaystyle 10$ m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily?
Marking-scheme solution
\begin{itemize}
\item[(a)] \(\displaystyle \beta_{o} \propto \lambda\)
\(\displaystyle \beta_{o}\) will increase with increase in wavelength.
\item[(b)] When path difference \(\displaystyle a \theta=\lambda\) or at an angle ; \(\displaystyle \theta \approx \lambda / a\)
\item[(c)] Differences
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