6) Define grating element and corresponding points.
Ans: Distance between two consecutive slits (lines) of a grating is
called grating element. If 'a' is the separation between two slits and
'b' is the width of a slit, then grating element 'd' is given by;
Ans: Distance between two consecutive slits (lines) of a grating is
called grating element. If 'a' is the separation between two slits and
'b' is the width of a slit, then grating element 'd' is given by;
d = a + b [or] d = length of grating/no. of lines
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