NEET PhysicsNCERT Class 12Optics

Wave Optics: NEET questions with solutions

NEET tests Huygens' wavefronts and what changes on refraction, coherent versus incoherent addition with I = 4I₀cos²(φ/2), fringe positions and width in Young's experiment, the single-slit minima and central maximum, and polarisation with Malus' law. Marks are lost by dropping the halving at the first polaroid, by expecting two independent lamps to interfere, and by confusing the single-slit minimum condition with the double-slit bright-fringe condition.

Revise first: NCERT notes for Wave Optics

Questions

10 questions · answers after you pick

1In a Young's double-slit set-up, the slits are 0.30 mm apart, the screen is 1.5 m away, and light of wavelength 600 nm is used. What is the…Young's double-slit experimentEasySingle correct 2Light of wavelength 600 nm in air enters glass of refractive index 1.5. What happens to its frequency and wavelength in the glass?Refraction of a plane waveEasySingle correct 3Unpolarised light of intensity I₀ falls on a polaroid P₁. The light then passes through a second polaroid P₂ whose pass axis is at 60° to…Malus' law and crossed polaroidsMediumSingle correct 4Two coherent sources each produce intensity I₀ at a point on a screen. At that point the waves from them have a phase difference of π/3.…Coherent and incoherent additionMediumSingle correct 5Light of wavelength 500 nm falls normally on a single slit of width 0.20 mm. The diffraction pattern is observed on a screen 2.0 m away.…Diffraction at a single slitMediumSingle correct 6In a Young's double-slit experiment with light of wavelength 500 nm, the slit separation is 0.60 mm and the screen is 1.2 m away. What is…Young's double-slit experimentHardSingle correct 7Two separate sodium lamps of equal brightness illuminate the same region of a screen. Read the Assertion (A) and Reason (R) and choose the…Coherent and incoherent additionEasyAssertion–Reason 8Unpolarised light of intensity I₀ passes through two crossed polaroids P₁ and P₃. A third polaroid P₂ is inserted between them with its pass…Malus' law and crossed polaroidsHardSingle correct 9A teacher writes four claims on the board about wavefronts and Huygens' construction. Which of the claims are correct?Wavefronts and Huygens principleMediumStatement based 10Match each situation in List I with the condition or result that describes it in List II (n is a whole number, a the slit width, I₀ the…Interference, diffraction and seeing themMediumMatch the following

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