Refraction of light rays at the two surfaces of a diverging concave lens. Refraction causes the separating of colours. 2. In going from a less dens e medium (air) to a more dense medium (glass), light bends towards the normal. Refraction through a rectangular glass slab and principle of reversibility of light: Consider a rectangular glass slab, as shown in figure. At the first surface, although the white light splits into its constituent colours on refraction, but these splitted colurs on suffering refraction at the second surface emerge out in form of a parallel beam, which give an impression of white light. Join up crosses with a ruler. And if this is a smaller number, this is a larger number. It’s about refraction really. And, as a result of this change in speed, it bends. Place the longest side of a rectangular acrylic polymer block against the first line. Compare Refraction through a rectangular parallel surfaced glass block and Refraction through a glass prism – a ray of light from the air when passes through a rectangular glass block with parallel surfaces then refraction happens twice – (1) when light enters from air to glass and (2) when it comes out of the glass block to the air. Prove that the incident angle and the emergent angle in a rectangular glass slab are equal. In 3D computer graphics, ray tracing is a rendering technique for generating an image by tracing the path of light as pixels in an image plane and simulating the effects of its encounters with virtual objects. BN is normal to interface between air and the refracting block.

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