mention any 2 problems that you might face during a long distance travel during this pandemic time. give solutions to deal with problems that you may encounter
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the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
measurement of the focusing characteristics of an eye or eyes.
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