Obviously, one cannot calculate two independent lattice parameters using just one experimental value. After you get more data, you can proceed using the equation
1/d2 = (4/3) (h2+hl+k2)/a2 + l2/c2
Thank you sir. But here there are two unknown parameter a and c. how is it possible
This is what I wrote in the first sentence. You need more d values. At least one, but for reliable results as many as possible.
In fact, there are not two but three parameters since you have also to take into consideration the zero-shift to compute the cell parameters. You need more Bragg peaks !
I guess you may resolve your problem by considering the c/a ratio for HCP structure which is constant i.e 1.633
The ratio c / a = (8/3) ^ 0.5 is true for an ideal HCP structure. It corresponds to the space group P63 / mmc. Here, wurtzite crystallises in the P63mc and thus does not satisfy to c / a = (8/3) ^ 0.5
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