The wave length of light in visible part `(lambda_(v))` and for sound `(lambda_(s))` are related as

The wavelength of two sine waves are lambda_(1) = 1 m and lambda_(2) = 6 m . Calculate the corresponding wave numbers .

Due to the relative motion between a star and the earth, the following relation is obtained between the wavelength of light from star lambda and Doppler displacement Delta lambda, (V_(s) = "celocity of star")

The wavelengths of violet, yellow and red light are lambda_(v), lambda_(y) and lambda_(r) respectively, then …………

The wavelength of electron waves in two orbits (lambda_(1) : lambda_(2))

The refractive index of light in glass varies with its wavelength according to equation mu (lambda) = a+ (b)/(lambda^(2)) where a and b are positive constants. A nearly monochromatic parallel beam of light is incident on a thin convex lens as shown. The wavelength of incident light is lambda_(0) +-Delta lambda where Delta lambda lt lt lambda_(0) . The light gets focused on the principal axis of the lens over a region AB. If the focal length of the lens for a light of wavelength lambda_(0) is f_(0) , find the spread AB.