At what angle for the first - order diffraction, spacing between two planes respectively is `lambda and (lambda)/(2)`?

If lambda_(1) and lambda_(2) are the wavelengths of the first members of the Lyman and Paschen series respectively, then lambda_(1) : lambda_(2) is

If lambda_(1) and lambda_(2) are the wavelength of the first members of the Lyman and Paschen series, respectively , then lambda_(1) :lambda_(2) is

If lambda_(1) and lambda_(2) are the wavelength of the first members of the Lyman and Paschen series, respectively , then lambda_(1) lambda_(2) is

If lambda_(1)= and lambda_(2) are the wavelengths of the first members of Lyman and Paschen series respectively, then lambda_(1): lambda_(2) , is

If lambda_1 and lambda_2 are the wavelengths of the first member of the Lyman and Paschen series respectively, then lambda_1 : lambda_2 is

If lambda_(1) and lambda_(2) are the wavelengths of the first members of the Lyman and Paschen series, respectivley, then lambda_(1) : lambda_(2) is

For sodium light, the two yellow ines occur at lambda_(1) and lambda_(2) wavelengths. If the mean of these two is 6000Å and |lambda_(2)-lambda_(1)|=6Å , then the approximate energy difference between the two levels corresponding to lambda_(1) and lambda_(2) is

For sodium light, the two yellow lines occur at lambda_(1) and lambda_(2) wavelengths. If the mean of these two is 6000Å and |lambda_(2)-lambda_(1)|=6Å , then the approximate energy difference between the two levels corresponding to lambda_(1) and lambda_(2) is