Two light waves superimposing at the mid point of the screen are coming from coherent of light with phase difference. 3n rad. their of magnitude are  1cm each. The resultamt amplitude at the given point will be:-

1. 5 cm

2. 3 cm

3. 2 cm

4. zero

In a double slit experiment using light of wavelength 600 nm, the angular width of the fringe on a distant screen is 0.1^o. The spacing between the 2 slits is :-

1. 3.44 x 10^-4 m

2. 1.54 x 10^-4 m

3. 1.54 x 10^-3 m

4. 1.44 x 10^-3 m

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 n/2 at point A, n and at point B. Then the difference between the resultant intensities at A and B is :-

1. 2I

2. 4I

3. 5I

4. 7I

A laser beam is used for locating distant objects because :-

1. it is monchromatic

2. it is constant

3. it is not observed

4. it has small angular spread

In young's double slit experiment two disturbances arriving at a point P have phase difference of n/3. The intensity of this point experiment as a fraction of maximum intensity of this point expressed as a fraction of maximum intensity I₀ is :-

1. $\frac{3}{2}{\mathrm{I}}_0$

2. $\frac{1}{2}{\mathrm{I}}_0$

3. $\frac{4}{3}{\mathrm{I}}_0$

4. $\frac{3}{4}{\mathrm{I}}_0$

Two slits in young's double slit experiment have width in the ratio 81: 1 . The ratio of the amplitude of light waves is :

1. 3: 1

2. 3: 2

3. 9: 1

4. 6: 1

In young's double slit experiment using monochromatic light of wavelength $\mathrm{\lambda }$. The intensity of light at a point on the screen with path difference $\mathrm{\lambda }$ is M unit. The intensity of light at a point where path difference is $\mathrm{\lambda }$/3 is :-

1. M/2

2. M/4

3. M/8

4. M/8

Yellow light of wavelength 6000 $\stackrel{\circ }{\mathrm{A}}$ produces fringes of width 0.8 mm in young's double slit experiment. If the source is replaced by another monochromatic source of wavelength 7500 $\stackrel{\circ }{\mathrm{A}}$ and the seperation between the slits is doubled then the fringe width becomes :-

1. 0.1 mm

2. 0.5 mm

3. 4.3 mm

4. 1 mm

In young's double slit experiment the distance between the slits S₁ and S₂ is 1 mm. What should be the width of each slit be so as to obtain 10 maxima of the double slit pattern within the central maximum of the single slit pattern?

1. 0.9 mm

2. 0.8 mm

3. 0.2 mm

4. 0.6 mm

The intensity of the maxima and minima in an interference pattern produced by two coherent sources of light 9: 1 . The intensities of the used light sources are in ratio :-

1. 3: 1

2. 4: 1

3. 9: 1

4. 10: 1