Optics Wave Optics Mock Tests

In a Young double-slit experiment, the slits are separated by distance d and the screen is at distance D. A thin glass plate of thickness t and refractive index μ is placed in front of one slit. If the central maximum shifts by a distance equal to one fringe width β, then t equals:

In a Young double slit experiment, the slits are separated by distance d and the screen is at distance D from the slits (D >> d). A thin glass slab of refractive index mu and thickness t is placed in front of one of the slits. The fringe width remains beta = lambda*D/d. The number of fringes shifted on the screen is:

In a Young double slit experiment, the slits are separated by distance d and the screen is at distance D from the slits. D is much greater than d. If a thin film of thickness t and refractive index mu is placed in front of one slit, the fringe width:

Unpolarized light of intensity I₀ passes through three polaroids P₁, P₂, P₃. P₂ is at angle θ to P₁ and P₃ is at angle 90 − θ to P₂. The intensity after P₃ is:

Light is incident normally on a thin film of thickness t and refractive index μ in air. The reflected light shows a maximum at wavelength λ₁ and a minimum at λ₂ (λ₂ < λ₁), with no other extrema between them. The thickness t is:

In a Young double slit experiment, the slits are separated by distance d and the screen is at distance D (D >> d). A thin glass slab of thickness t and refractive index μ is placed in front of one slit. If the central maximum shifts by a distance equal to the fringe width, the thickness t is:

In a Young's double slit experiment, the slits are separated by 0.5 mm and the screen is 1.0 m away. If the wavelength of light used is 500 nm, the distance between the central maximum and the 5th bright fringe is:

In a double-slit experiment, the intensity at the central maximum is I_0. If one of the slits is covered, the intensity at the same point becomes: