EASY
JEE Main
IMPORTANT
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Orange light of wavelength  6000×1010 m illuminates a single slit of width 0.6×104 m. The maximum possible number of diffraction minima produced on both sides of the central maximum is __________

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Important Questions on Wave Optics

MEDIUM
JEE Main
IMPORTANT
A beam of electrons of energy E scatters from a target having atomic spacing of 1 . The first maximum intensity occurs at θ=60°. Then E(in eV) is........
(Planck's constant h=6.64×10-34 J s, 1 eV=1.6×10-19J, electron mass m=9.1×10-31 kg)
MEDIUM
JEE Main
IMPORTANT

Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength λ=1 m are in phase. S1 and S2 are placed 1.5 m apart (see fig). A listener, located at L, directly in front of S2, finds that the intensity is at a minimum when he is 2 m away from S2. The listener moves away from S1, keeping the distance from S2 fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S1. Then d is :

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MEDIUM
JEE Main
IMPORTANT
A sound source S is moving along a straight track with speed v, and is emitting sound of frequency v0.An observer is standing at a finite distance, at the point O, from the track. The time variation of frequency heard by observer is best represented by : (to represents the instant when the distance between the source and observer is minimum)
MEDIUM
JEE Main
IMPORTANT

In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20m. The separation between P and Q is 5m and the phase of P is ahead of that of Q by 90°.A,B and C are three distinct point of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A,B,C will be in the ratio :

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MEDIUM
JEE Main
IMPORTANT
A Young's double-slit experiment is performed using monochromatic light of wavelength λ. The intensity of light at a point on the screen, where the path difference is λ, is K units. The intensity of light at a point where the path difference is λ6 is given by nK12, where n is an integer. The value of n is 
HARD
JEE Main
IMPORTANT
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser needs to be rotated further, to reduce the output intensity to zero, is
HARD
JEE Main
IMPORTANT
Visible light of wavelength 6000×10-8cm falls normally on a single slit and produces a diffraction pattern. It is found that the second diffraction minimum is at 60o from the central maximum. If the first minimum is produced at θ1, then θ1 is close to
HARD
JEE Main
IMPORTANT
In a Young’s double slit experiment, the separation between the slits is 0.15 mm . In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is: