Find the position of the first minimum with respect to central maxima for a single slit of width
0.04 mm , on a screen 2 meters distance , when light from a He -Ne laser λ = 632.8 nm is shone
on the slit.

A parallel beam of light of wavelength 6000 Å is incident normally on a slit of width 0.2 mm .
The diffraction pattern is observed on a screen which is placed at the focal plane of a convex lens of focal length 50 cm . If the lens is placed close to the slit, the distance between the minima on both sides of the central maximum will be

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on the screen. Phase difference between the beams is π/2 at point A and π at point B. Then the difference between resultant intensities at A and B is

Waves from two slits are in phase at the slits and travel to a distant screen to produce the second minimum of the interference pattern. The difference in the distance travelled by the waves is :

In YDSE setup, light of wavelength 640 nm is used with d = 0.8 m m and D = 1m . If intensity
at central maxima is I0 and it’s position is y = 0,

Minimum thickness of a mica sheet (which should be placed in front of one of the slits in YDSE) required to reduce the intensity at the centre of screen to half of maximum intensity is (the refractive index of the sheet is 3/2) Assume that the sheet does not absorb any light.

In a standard Young’s double slit setup, we get 60 fringes on a section of screen with
monochromatic light of wavelength 4000 Å. If we use monochromatic light of wavelength 6000Å, then the number of fringes that would be obtained in the same section is

Light of wavelength 600 nm is incident upon a single slit with width \[4\times 10^{-4} m\] . The figure shows the pattern observed on a screen positioned 2 m from the slits . Determine the distance s.

In a Young’s double slit experiment, a small detector measures an intensity of illumination of
I units at the centre of the fringe pattern. If one of the two (identical) slits is now covered, the
measured intensity will be

Young’s double slit experiment is carried out by using green, red and blue light, one color at a time .The fringe widths recorded are \[\beta_{G}, \beta_{R} and \beta_{B},\] respectively. Then,