Chapter 9: Optics – Interference, Diffraction & Polarization (Set-2)

Interference of light occurs due to

For interference, sources must be

In YDSE, fringe width β is given by

Increasing slit separation (d) in YDSE causes fringe width β to

In YDSE, central bright fringe is formed where path difference is

Condition for constructive interference is

Condition for destructive interference is

In YDSE, intensity at a point is proportional to

Using white light in YDSE gives

In thin film interference, the phase change on reflection from denser medium is

For thin film in reflected light, constructive interference occurs when

For transmitted light, constructive interference in thin films is

Newton’s rings are formed due to

In Newton’s rings, central spot is dark because

Radius of m-th dark ring in Newton’s rings is

Michelson interferometer fringe visibility is maximum when

In Michelson interferometer, one fringe shift corresponds to mirror moved by

The basic requirement of Michelson interferometer is

Visibility (V) of fringes is defined as

Coherence length is

Spatial coherence depends on

Temporal coherence depends on

Phase difference in YDSE at angle θ is

If one slit in YDSE is closed, fringe pattern becomes

A soap film shows colours due to

Path difference in reflected light from thin film of thickness t and refractive index μ is

Newton’s rings shape is

Michelson interferometer measures

With increasing thickness of a thin film, interference fringes

In YDSE, if slit separation doubles, number of fringes in same region

For maximum fringe contrast, amplitudes of interfering waves must be

Fringe visibility is zero when

In Newton’s rings experiment, if plano-convex lens is replaced by a convex lens of larger radius, rings become

Michelson interferometer uses

In YDSE, if one slit is covered with thin transparent film, central fringe shifts because

A localized fringe pattern appears in

Thin film interference occurs because of

Newton’s rings diameter ratio for successive dark rings is

Michelson fringes shift when

Optical path difference =

Interference is absent if

YDSE uses

Thin film of oil on water produces colours because

Michelson interferometer gives circular fringes when

Fringe width in interference depends on

Interference energy distribution follows

In YDSE, if slit width increases greatly

Newton’s rings appear coloured with

Michelson interferometer fringes become very sharp when

YDSE fringe shift due to path change Δx is