Table 2: The (n, k) values obtained by previous authors and in our present work, for comet Halley at different wavelengths.
$\lambda$ n k Authors

0.365 $\mu{\rm m}$ 1.392 0.024 Mukai et al. (1987)

1.387 0.032 Sen et al. (1991a)

1.403 0.024 Present work

0.484 $\mu{\rm m}$ 1.387 0.031 Mukai et al. (1987)

1.375 0.040 Sen et al. (1991a)

1.390 0.026 Present work

0.620 $\mu{\rm m}$ 1.385 0.035 Mukai et al. (1987)

0.684 $\mu{\rm m}$ 1.374 0.052 Sen et al. (1991a)

1.386 0.038 Present work

**Table 2:** The (n, k) values obtained by previous authors and in our present work, for comet Halley at different wavelengths.
$\lambda$	n	k	Authors
0.365 $\mu{\rm m}$	1.392	0.024	Mukai et al. (1987)
	1.387	0.032	Sen et al. (1991a)
	1.403	0.024	Present work
0.484 $\mu{\rm m}$	1.387	0.031	Mukai et al. (1987)
	1.375	0.040	Sen et al. (1991a)
	1.390	0.026	Present work
0.620 $\mu{\rm m}$	1.385	0.035	Mukai et al. (1987)
0.684 $\mu{\rm m}$	1.374	0.052	Sen et al. (1991a)
	1.386	0.038	Present work

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