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Contents of Physics - 1 : Heat and Light : 317
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Fig. 2: Virtual Image.
Fig. 3 : Real Image.
The above figures indicate that there are two causes of image formations by the reflecting surfaces - (i) nature of the reflecting surface and (ii) linear propagation of light. We find that canons contain one of the two causes. Secondly, image is just a feeling or visual light effect. It is not actual. Thus, the images' particulate nature does not seem to be reasonable. Sikdar64 also points out this difference in canonical and scientific contentions. Thus, the cooling shadow of tree or images could be termed mattergic rather than material. Thirdly, shadows must be taken as of different nature from darkness. Seeing Objects : Theory of Non-contactility of the Eye
It is a common experience that seeing and knowing. about an object is a phenomena directly related with light and sense of sight. However, one does not find a reasonable total mechanism about this process in canons. Nevertheless, Pūjya pāda65 points out that the eye sees only suitably qualified objects which stand in proper direction, distance and illuminated with light without actual contact with it like other senses. He also mentions that all the factors like sense, mind, light and even the object are only efficient causes rather than the immediate ones for seeing an object.
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