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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.
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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.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
Several analogous types of eyes have developed independently through convergent evolution.
The inability to differentiate certain shades of colour is called colour vision deficiency.
This animation demonstrates the design and operation of a traditional cinema projector.
This animation demonstrates the structure and operation of digital cameras.
The skin is the soft outer covering of our body, its three layers are the epidermis, the dermis and the hypodermis.
Taste receptors convert chemical stimuli into electric signals.
This animation shows the symptoms and treatment of secretory otitis media.
Olfactory receptors produce electric signals when stimulated by odours.
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.
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.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
The information gathered by the eye is misinterpreted by the brain.