امتحان مادة Physics || لشهر اكتوبر

The critical angle between two media depends on…….

If the refractive index of glass is , the biggest angle of incidence that lets a light ray emerges from glass to air equals…..

A point source of light is placed 4 m below the surface of water of refractive index the minimum diameter of a disc which should be placed over the source on the surface of water to cut off all light coming out water is……..

If the ratio between the frequency of the red light in air to that in water  ……..

When a light ray falls at an angle from a medium of refractive index 1.2 on a surface of another medium of refractive index 1.5, ……

A light ray falls from air on the surface of a glass slab at an angle of 52˚. If the ray is deviated by an angle 19˚, the refractive index of glass is……..

When a light ray transmits from a less optical dense medium to another optical denser medium with an angle of incidence = zero, which of the following light properties does not change?…..

When a light ray falls from air on water surface at an angle of 60˚, the angle of refraction will be…..

If the ratio between the refractive index of the first medium and the refractive index of the second medium is  , the ratio between the speed of light in the first medium and the speed of light in the second medium is……..

if a light ray falls on liquid surface by 30 and refracts by 22. Calculate the critical angle of this liquid

In Young’s double – slit experiment, the separation distance between the two slits was 10^-4 m and the distance between two consecutive fringes of the same type is found to be 3.75 mm when they appear on an observation screen at a distance 0.75 m from the two slits, so the wavelength of the used light equals…..

In Young’s experiment; the path difference between the two rays coming from the two slits to the first dark fringe equals….

The ratio between the width of the central bright fringe when conducting Young’s double – slit experiment with red light and its width when using violet light is……

In Young’s double – slit experiment, if R = 10⁴ d so…..

a) ∆y = λ

b) ∆y = 10⁴ λ

c) ∆y = 10^-4

d) ∆y = λ / 10

In Young’s double – slit experiment, if the distance between the centers of the fifth bright fringe (maxima) and the central fringe is x, so the distance between the centers of the second dark fringe (minima) and the central fringe is……

If the distance between the first bright and the central fringe in Young’s double – slit experiment is 2 mm, so the distance between the third minimaark and the central fringe equals…..

A triangular prism has an apex angle 60˚ and refractive index , so the minimum angle of incidence of a ray on one of the faces of the prism that makes the ray emerge from the other face of the prism is…….

A light ray fell perpendicularly on one of the faces of a triangular prism whose refractive index is . If the ray emerged tangentially to the other face of the prism, find the apex angle of the prism