Ray Optics Part 2

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 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 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 approximately for an aperture of 2mm and wavelength 500 nm.

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