Diffraction

Diffraction is an concept from the MPSC syllabus, tested in 2 past MPSC questions (2018). Below are those real questions with their correct answers and explanations.

Real questions

Years tested

1 · 2018–2018

In context

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Asked in

2018

What mastering this unlocks

X-raysCrystal structure

Real questions that test this

एकमेकांपासून 1 मिलिमीटर अंतरावर असलेली दोन समांतर रेखाच्छिद्र पडद्यापासून 1 मीटर अंतरावर ठेवलेल्या आहेत. त्यांच्यावर 500 नॅनोमीटर तरंगलांबीची शलाका सोडल्यानंतर पडद्यावर व्यतिकरण परिणामामुळे तयार झालेल्या पत्तीमधील अंतर किती ? Two parallel slits 1 millimetre apart are placed 1 metre away from the screen. What is the fringe separation due to interference effect, when a beam of wavelength 500 nanometres is incident on them ?

a)5.0 mm

b)0.5 mm✓ Correct

c)5.0 cm

d)0.05 mm

Fringe separation formula β = λD / d. Substituting λ = 500 nm, D = 1 m, d = 1 mm gives the fringe width as 0.5 mm.

फ्रेसनल्स बायाप्रिझम मध्ये (λ) तरंगलांबीची किंमत कशावर अवलंबून असते ? / In Fresnel's Biprism, the value of wavelength (λ) depends upon

1)दोन संलग्न उगमास्थानातील अंतर / The distance between two coherent sources

2)फ्रिंजची रुंदी / The fringe-width

3)स्लिट व दूरदर्शकाची नेत्रकाच यातील अंतर / The distance between slit and eyepiece of telescope

4)वरील सर्व / All of the above✓ Correct

In Fresnel's biprism experiment, the wavelength of light depends on fringe width, distance between coherent sources, and distance between slit and eyepiece, as all these variables are mathematically related in the fringe width formula.