The two slits at a distance of 1 mm are illuminated by the light of wavelength 6.5× 0^–7m. The interference fringes are observed on a screen placed at a distance of 1 m. The distance between third dark fringe and fifth bright fringe will be

The slits in a Young’s double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is I₀. If one of the slits is closed, the intensity at this point will be

In double slit experiment, the angular width of the fringes is 0.20° for the sodium light (λ = 5890 Å). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is

In Young’s experiment, light of wavelength 4000 Å is used, and fringes are formed at 2 metre distance and has a fringe width of 0.6 mm. If whole of the experiment is performed in a liquid of refractive index 1.5, then width of fringe will be

Two identical sources emitted waves which produces intensity of k unit at a point on screen where path difference is λ. What will be intensity at a point on screen at which path difference is λ/4

A thin mica sheet of thickness 2 × 10^-6m and refractive index (μ = 1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000Å. The central bright maximum will shift

In a YDSE fringes are observed by using light of wavelength 4800 Å, if a glass plate (μ = 1.5) is introduced in the path of one of the wave and another plates is introduced in the path of the (μ = 1.8) other wave. The central fringe takes the position of fifth bright fringe. The thickness of plate will be

In young double slit experiment  (d = distance between slits, D = distance of screen from the slits). At a point P on the screen resulting intensity is equal to the intensity due to individual slit I₀. Then the distance of point P from the central maxima is (λ = 6000 Å)

Two identical radiators have a separation of d = λ/4, where λ is the wavelength of the waves emitted by either source. The initial phase difference between the sources is π/4. Then the intensity on the screen at a distance point situated at an angle θ = 30^o from the radiators is (here I₀ is the intensity at that point due to one radiator)

In YDSE a source of wavelength 6000 Å is used. The screen is placed 1 m from the slits. Fringes formed on the screen, are observed by a student sitting close to the slits. The student's eye can distinguish two neighbouring fringes. If they subtend an angle more than 1 minute of arc. What will be the maximum distance between the slits so that the fringes are clearly visible