The PRISM program annually collects hundreds of millions of telephone records such as calls and texts, including those belonging to American users. But now the program, run by the National Security Agency, is considering cutting the program as it lacks operational value and hasn’t been used for the past six months.

cube

A prism with bases that are regular polygons. The bases are not necessarily aligned one directly above the other. Note: For some mathematicians regular prism means the same as right regular prism.

Right Rectangular Prism – Definition with Examples A right rectangular prism is a three-dimensional object with 6 faces, 12 edges and 8 vertices. the angles between the base and sides are right angles. all the 6 faces are rectangles.

A prism is a three-dimensional solid figure with two parallel faces, called bases, that are congruent polygons, and lateral flat faces which are rectangles in a right prism, and are parallelograms in an oblique prism.

six sides

Answer. The angle between two surfaces is known as refracting angle or angle of prism. In a prism, a ray of light suffers two refraction and the result is deviation.

In minimum deviation, the refracted ray in the prism is parallel to its base. In other words, the light ray is symmetrical about the axis of symmetry of the prism. Also, the angles of refractions are equal i.e. r1 = r2. The formula for minimum deviation can be derived by exploiting the geometry in the prism.

Mostly used in telescopes, periscopes and microscopes, scientists also use prisms in experiments that help them study the reaction of the human eye to light. Prisms constitute any three-dimensional shape with two faces of the same size and shape and parallelogram sides.

There are four main types of prisms: dispersion prisms, deviation, or reflection prisms, rotation prisms, and displacement prisms.