Ray diverging from a point source forms a wave front that is -

1. Cylindrical

2. Spherical

3. Plane

4. Cubical

Concept Questions :-

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Two coherent sources have intensity in the ratio of 1001. Ratio of (intensity) max/(intensity) min is 

(1) 1100

(2) 110

(3) 101

(4) 32

Concept Questions :-

Superposition principle
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If two waves represented by y1=4sinωt and y2=3sinωt+π3 interfere at a point, the amplitude of the resulting wave will be about 

(1) 7

(2) 6

(3) 5

(4) 3.5

Concept Questions :-

Superposition principle
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Two coherent sources of intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be 

(1) I1 + I2

(2) I12+I22

(3) (I1 + I2)2

(4) (I1+I2)2

Concept Questions :-

Superposition principle
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Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π2 at point A and π at point B. Then the difference between the resultant intensities at A and B is 

(1) 2I

(2) 4I

(3) 5I

(4) 7I

Concept Questions :-

Superposition principle
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Two waves are represented by the equations y1=asinωt and y2=acosωt. The first wave 

(1) Leads the second by π

(2) Lags the second by 2π

(3) Leads the second by π2

(4) Lags the second by π2

Concept Questions :-

Superposition principle
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If an interference pattern have maximum and minimum intensities in 36 : 1 ratio then what will be the ratio of amplitudes 

(1) 5 : 7

(2) 7 : 4

(3) 4 : 7

(4) 7 : 5

Concept Questions :-

Superposition principle
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In Young's double slit experiment, if the slit widths are in the ratio 1 : 9, then the ratio of the intensity at minima to that at maxima will be 

(1) 1

(2) 1/9

(3) 1/4

(4) 1/3

Concept Questions :-

Young Double slit experiment
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In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 Å, the fringe width will be 

(1) 0.5 mm

(2) 1.0 mm

(3) 1.2 mm

(4) 1.5 mm

Concept Questions :-

Diffraction
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Two coherent light sources S1 and S2 (λ= 6000 Å) are 1mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be 

(1) 0.015 cm

(2) 0.025 cm

(3) 0.010 cm

(4) 0.030 cm

Concept Questions :-

Diffraction
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