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knowledge of science acquired by laboratory methods depends entirely upon the grasping capability of our senses or the input of information fed to our senses by the instruments and gadgets. Our perceptive range to pick up electro-magnetic waves from the environment is limited. Our eyes can pick up stimuli of wavelength ranging from .00004 to .00007 cms. The object emitting waves longer or shorter than this range is not visible to us; Infra-red rays that have slightly longer wavelength ranging from .00008 to .032 cms. cannot be seen by our eyes, although we can feel them on the skin in the form of heat. Similarly the wavelength of the Ultra-Violet rays ranging from .00003 to .000001 cms, falls short of our visual perceptive range but can be recorded on suitable photographic plate. X-rays that have still shorter wave-length can also be recorded on X-ray films. There are other electro-magnetic waves with wavelengths shorter or longer than the ordinary light, namely radio-active emissions of Gamma rays from Radium, cosmic radiation, radar waves, radio and television transmission waves, that are not visible to our eyes, although they can be easily picked up by means of various instruments. The world of stimuli beyond the range of these instruments, however, remains unknown to the physical science today. The Lunar landscape known to science today is also subject to this restriction in perceptiveness of scientific instruments. Even science concedes the possibility of discovering an altogether different perspective of the world around us, if we could develop perceptive capability finer and subtler than what we possess by way of our senses oi instrumental sensors in use today.
In this reference, following quotes are quite telling :
These philosophical subtlties have a profound bearing on modern science ... for the human eye is sensitive only to the narrow band of radiation that falls between the red and the violet ... it is evident, therefore,
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