In a two-slit intereference experiment, if a thin transparent sheet of thickness f and refractive index $n_m$ covers both the slits, the optical path difference between the two interfering waves

changes by $\frac{D}{d} (n_m - 1)t$

In a biprism experiment two interfering waves are produced by division of

neither wavefront nor amplitude.

increases with increase in wavelength

decreases with increase in wavelength

increases with decrease in wavelength

remains unchanged with change in wavelength

a short focus convex lens that forms real images of the virtual sources

a long focus convex lens that forms real images of the virtual sources

a short focus concave lens that forms real images of the virtual sources

a short focus convex lens that forms virtual images of the virtual sources

a short focus convex lens that forms real images of the virtual sources

increases with increase in wavelength

a short focus convex lens that forms real images of the virtual sources

In a two-slit intereference experiment, if a thin transparent sheet of thickness f and refractive index $n_{m}$ covers both the slits, the optical path difference between the two interfering waves

In Fresnel’s biprism experiment, with the eyepiece 1 m from the two coherent sources, the fringe width obtained is 0.4 mm. If just the eyepiece is moved towards the biprism by 25 cm, then the fringe width

In a biprism experiment, keeping the experimental setup unchanged, the fringe width

In finding the distance between the two coherent sources in Fresnel’s biprism experiment by the conjugate foci method, one uses

Using a light of wavelength 4800 Å in Fresnel’s biprism experiment, 21 fringes are obtained in a given region. If light of wavelength 5600 Å is used, the number of fringes in the same region will be

To obtain pronounced diffraction with a single slit illuminated by light of wavelength λ, the slit width should be

In single slit diffraction (at a narrow slit of width a), the intensity of the central maximum is