The wavelength of light in a medium is `lamda=lamda_0/mu` where `lamda` is the wavelength in vacuum. A beam of red light `(lamda_0=720 nm)` enters into water The wavelength in water is `lamda=lamda_0/mu=540 nm.` To a person under water does this light appear green?

A wavelength of a monochromatic light in vacuum is lambda . It travels from vacuum to a medium of absolute refractive index mu . The ratio of wavelength of the incident and refracted wave is

Sound waves of wavelength lamda travelling in a medium with a speed of v m/s enter into another medium where its speed is 2v m/s. Wavelength of sound waves in the second medium is

The intensity at the maximum in a Young's double slit experiment is I_(0) . Distance between two slits is d=5 lambda where lambda is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance D=10d ?

If a size of particle is a and wavelength of light is lamda for a lt lt lamda scattering is directly proportional to….

A single slit of width d is placed in the path of beam of wavelength lamda . The angular width of the principal maximum obtained is-

A prism of refractive index n_(1) & another prism of reactive index n_(2) are stuck together without a gap as shown in the figure.The angle of the prisms are as shown. n_(1)&n_(2) depend on lambda ,the wavelength of light according to n_(1)=1.20+(10.8xx10^(4))/(lambda^(2)) & n_(2)=1.45+(1.80xx10^(4))/(lambda^(2)) where lambda is in nm. (i)Calculate the wavelength lambda_(0) for which rays incident at any angle on the interface BC pass through without bending at that interface. (ii) for light of wavelength lambda_(0) ,find the angle of incidencei on face AC such that the deviation produced by the combination of prism is minimum.

Huygen was the figure scientist who proposed the idea of wave theory of light he said that the light propagates in form of wavelengths. A wavefront is a imaginary surface of every point of which waves are in the same. phase. For example the wavefront for a point source of light is collection of concentric spheres which have centre at the origin w_(1) is a wavefront w_(2) is another wavefront. The radius of the wavefront at time 't' is 'ct' in thic case where 'c' is the speed of light the direction of propagation of light is perpendicular to the surface of the wavelength. the wavefronts are plane wavefronts in case of a parallel beam of light. Huygen also said that every point of the wavefront acts as the source of secondary wavelets. The tangent drawn to all secondary wavelets at a time is the new wavefront at that time. The wavelets are to be considered only in the forward direction (i.e., the direction of propagation of light) and not in the reverse direction if a wavefront w_(1) and draw spheres of radius 'cDeltat' they are called secondary wavelets. Draw a surface w_(2) which is tangential to all these secondary wavelets w_(2) is the wavefront at time t+Deltat Huygen proved the laws of reflection and laws of refraction using concept of wavefront. Q. A point source of light is placed at origin, in air. the equation of wavefront of the wave at time t, emitted by source at t=0 is (take refractive index of air as 1)

The power radiated by a black body is P and it radiates maximum energy at wavelength, lamda_(0) . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 3/4lamda_(0) , the power radiated by it becomes nP. The value of n is

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light? Refractive index of water is 1.33.

In a double-slit experiment the angular width of a fringe is found to be 0.2^(@) on a screen placed 1 m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water? Take refractive index of water to be 4/3.