Ray optics|board|part1|jee and neet|

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 ?

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?

In geometrical optics a ray of light is defined as

Ray optics is valid, when characteristic dimensions are

Assertion: Ray of light passing through optical centre of a lens goes undeviated. Reason: Ray falls normal at optical centre and in normal incidence, there is no deviation of light.

Four indicident rays of light parallel to optic axis and their path after passing through an optical system are shown in table-1. match the corresponding optical instrument from table 2.

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.

When a ray of light travels from an optically less denser medium to an optically more denser medium, the angle of incidence is always less than angle of refraction.