How fast should a car move for the driver to perceiver a red traffic light `(lambda ~~0.70 mum)` as a green one `(lambda' ~~ 0.55 mu m)`?

Calaculate the minimum spearation between two points on the Moon which can be resolved by a reflecting telescope with mirror diameter 5m . The wavelength of light is assumed to be equal to lambda = 0.55 mu m .

For the Fabry-Perot etalon of thickness d = 2.5 cm find: (a) the highest order of interference of light with wavelength lambda = 0.50 mu m , (b) the dispersion region Delta lambda , i.e the spectral interval of wavelengths, within which there is still no overlap with orders of interference if the observation is carried out appoximately at wavelength lambda = 0.50 mu m .

How fast a person should drive his car so that the red signal fo light apperas green ? ( Wavelength for red colour = 6200 Å and wavelength for green colour = 5400 Å)

How fast a person should drive his car so that the red signal fo light apperas green ? ( Wavelength for red colour = 6200 Å and wavelength for green colour = 5400 Å)

Illuminating the surface of a certain metal alternatrly with light of wavelengths lambda_(1) = 0.35 mu m and lambda_(2) = 0.54 mu m , it was found that the corresponding maximum velocities of photoelectrons differ by a factor eta = 2.0 . Find the work function of taht metal.

There is a telescope whose objective has a diameter D = 5.0 cm . Find the resolving power of the objective and the minimum separation between two points at a distance l = 3.0km from the telescope, which it can resolve (assume lambda = 0.55 mu m) .

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.