Ray Optics Part 1

In geometrical optics a ray of light is defined as

Ray optics is valid, when characteristic dimensions are

A: Ray optics assumes that light travels in a straight line which is disapproved by diffraction effects, yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. R: Typical sizes of apertures involved in ordinary optical instruments are much larger than the wavelength of light.

For what distance is ray optics a good approximation when the aperture is 2 mm wide and wavelength is 600 nm ?

For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?

For what distance is ray optics a good approximation when the aperture is 2 mm wide and wavelength is 600 nm ?

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm ?

The distance upto which ray optics holds good is called

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm .

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm .