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DO ANGSTROM & A.U STAND FOR THE SAME LENGTH
Astronomical unit (A.U.) : One astronomical unit is equal to the mean distance between the earth and the sun .i.e.,
     1 A.U = 1.496 x 1011 metre 
Angstrom ( Å ):It is 10-10 th part of a metre.It is expressed by the symbol  Å. i.e.,
                 
                                    1  Angstrom  ( Å ) = 10-10 metre
                                                                 = 10-8 cm = 10-1 nm
     Therefore                               1 micron = 10,000 Å
                                      and            1  nm = 10 Å 


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