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Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
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The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The curvature of the lens of the eye changes when we look at a distant or at a near object, to ensure a sharp image.
Several analogous types of eyes have developed independently through convergent evolution.
The inability to differentiate certain shades of colour is called colour vision deficiency.
Flat feet, or fallen arches, may cause a number of health problems.
This animation demonstrates the structure and operation of digital cameras.
This animation shows the symptoms and treatment of secretory otitis media.
Olfactory receptors produce electric signals when stimulated by odours.
Observatories are often built at high elevations to minimise the effects of atmospheric turbulence
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
This animation shows optical and radiotelescopes used in astronomical observation.
The ear converts the vibrations of air into electric signals which are then processed by the brain.
Taste receptors convert chemical stimuli into electric signals.
A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.
The position and acceleration of the head is detected by the inner ear.