Two slits in Young’s experiment have widths in the ratio of 1:25. The ratio of intensity at the maxima and minima in the interference pattern $\frac{I_{ma\mathrm{x }}}{I_{mi\mathrm{n }}}$ is:

1. $\frac{9}{4}$

2. $\frac{121}{49}$

3. $\frac{49}{121}$

4. $\frac{4}{9}$

At the first minimum adjacent to the central maximum of a single slit diffraction pattern, the phase difference between the Huygen’s wavelet from the edge of the slit and the wavelet from the midpoint of the slit is:

1. $\frac{\mathrm{\pi }}{4} \mathrm{radian}$

2. $\frac{\mathrm{\pi }}{2} \mathrm{radian}$

3. $\mathrm{\pi } \mathrm{radian}$

4. $\frac{\mathrm{\pi }}{8} \mathrm{radian}$

For a parallel beam of monochromatic light of wavelength $\text{'}\lambda \text{'}$, diffraction is produced by a single slit whose width 'a' is much greater than the wavelength of the light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be:

1. $\frac{2\mathrm{D\lambda }}{\mathrm{a}}$

2. $\frac{\mathrm{D\lambda }}{\mathrm{a}}$

3. $\frac{\mathrm{Da}}{\mathrm{\lambda }}$

4. $\frac{2\mathrm{Da}}{\mathrm{\lambda }}$

A beam of light of λ = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is:

1. 1.2 cm

2. 1.2 mm

3. 2.4 cm

4. 2.4 mm

In Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wavelength of light used). The intensity at a point where the path difference is λ/4 will be:

1. K

2. K/4

3. K/2

4. zero

In Young’s double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths λ₁ = 12000 Å and λ₂ = 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit, will a bright fringe from one interference pattern coincide with a bright fringe from the other?

1. 6 mm

2. 4 mm

3. 3 mm

4. 8 mm