Start learning →

JEE Advanced Wave Optics — practice questions — page 4

Explore 94 free Wave Optics questions in JEE Advanced Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Wave Optics with Quill →

Wave Optics questions and exercises with answers

Showing questions 91–94 of 94.

In Young's experiment, a BRIGHT fringe (constructive interference) requires path difference = ?Read the answer and worked solution →In Young's double-slit experiment, the fringe width β is given by:Read the answer and worked solution →The resolving power (RP) of a diffraction grating with N slits in the m-th order is:Read the answer and worked solution →Polarisation of light is direct experimental evidence that light is a:Read the answer and worked solution →

Worked practice questions

In Young's experiment, a BRIGHT fringe (constructive interference) requires path difference = ?

  1. $(n + 0.5)\lambda$, n = 0, 1, 2, …
  2. Always $0$, regardless of n
  3. Half wavelength $\lambda/2$ only
  4. $n\lambda$, n = 0, 1, 2, …
Show answer and solution

Correct answer: D. $n\lambda$, n = 0, 1, 2, …

Constructive interference (bright) requires path difference = nλ (n = 0, ±1, ±2, ...) so waves arrive in phase. Destructive (dark) needs (n + ½)λ.

Open this question →

In Young's double-slit experiment, the fringe width β is given by:

  1. $\beta = \lambda d / D$
  2. $\beta = D / (\lambda d)$
  3. $\beta = \lambda D / d$
  4. $\beta = \lambda / (D d)$
Show answer and solution

Correct answer: C. $\beta = \lambda D / d$

**Young's fringe width:** β = λD/d. λ = wavelength; D = slit-to-screen distance; d = slit separation. Larger λ, larger D, smaller d → wider fringes.

Open this question →

The resolving power (RP) of a diffraction grating with N slits in the m-th order is:

  1. $RP = mN$
  2. $RP = m + N$ (sum)
  3. $RP = m / N$ (ratio)
  4. $RP = m^2 + N^2$
Show answer and solution

Correct answer: A. $RP = mN$

**Diffraction grating:** RP = λ / Δλ = mN (where N = number of slits illuminated, m = diffraction order). Higher orders + more slits = sharper, better-separated spectral lines.

Open this question →

How to practise

  1. Choose a Wave Optics question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Wave Optics practice for JEE Advanced. Read explanations as you go. No signup form needed to start.

Practise Wave Optics →

More Physics topics

Semiconductor ElectronicsUnit 2A: Newton's Laws and Translational EquilibriumAtoms and NucleiRay Optics and Optical InstrumentsElectric Charges and FieldsCurrent ElectricityLaws of MotionGravitation