TS EAMCET · Physics · Wave Optics
If the slit width is \(2 \mathrm{~mm}\) and wavelength of light used is \(4000 Å\), then Fresnel distance is nearly
- A \(2 \mathrm{~mm}\)
- B \(10 \mathrm{~m}\)
- C \(20 \mathrm{~km}\)
- D \(2 \mu \mathrm{m}\)
Answer & Solution
Correct Answer
(B) \(10 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
(b) Slit width \(\mathrm{a}=2 \mathrm{~mm}=2 \times 10^{-3} \mathrm{~m}\). \(\lambda=4000 \mathrm{~A}^{\circ}=4 \times 10^{-7} \mathrm{~m}\). Fresnel distance: \(\mathrm{Z}_{\mathrm{F}}=\frac{\mathrm{a}^2}{\lambda}=\frac{4 \times 10^{-6}}{4 \times 10^{-7}}=10\)…
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