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Rev. Notes > IGCSE > Light
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Nature of light

Important features of light

Reflection of light

Use of mirror (Periscope)

Refraction of light

Refractive index

Critical angle

Total internal reflection

Use of prism (Periscope)

Convex lens

Behavior of standard rays after passing through convex lens

Image formed by convex lens

Nature and position of image produced by convex lens

Principle of camera

Dispersion of light

Newton's experiment for dispersion of light

Improvement in Newton's experiment for dispersion of light

Recombination of colors


Reflection through plane mirror

Image through plane mirror

Test Yourself


Improvement in Newton's experiment for dispersion of light

The spectrum formed in Newton's first experiment was not pure. The spectrum obtained consisted of series of circular coloured images ovelapping on each other. Later on Newton deviced the arrangement as shown in the figure below.


A converging lens 'L' is placed so as to form an image 'I' , of a narrow slit 'S' which is illuminated by a bulb of white light. A prism is placed between the screen and the lens 'L'. When light passed through the prism, dispersion is produced and a pure spectrum is seen on a screen. This consists of series of coloured images of the slit, all very close to each other. If slit is made narrow, overlapping is reduced and the resulting spectrum will be more pure. The spectrum will be more clear, if the position of the prism is set for the minimum deviation.


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