Observations on comet C/2007 N3 ( Lulin ) were made at phase angles close to opposition ( 1.7 ^ { \circ } - 10 ^ { \circ } ) .
Photometric observations were carried out during 2009 February 24-28 , in the IHW blue and red continuum and R broad band using photo-polarimeter mounted on the 1.2m telescope at Mt Abu IR Observatory .
In all the bands , a significant linear increase in brightness with decreasing phase angle is detected for the above phase angle range .
The phase coefficient ( \beta = 0.040 \pm 0.001 mag deg ^ { -1 } estimated in IHW red ( 6840Å ) filter band ) is found to be independent of wavelength .
No non-linear opposition surge is observed for phase angle > 1.7 ^ { \circ } .
The linear increase in brightness with decreasing phase angle in the range mentioned earlier can be explained using the shadow hiding model .
The colour of the comet is found to be similar to the solar colour indicating the dominance of grains larger than 0.1 \mu m .
A dip in the brightness of about 0.20 mag is seen at the phase angle \sim 6.5 ^ { \circ } .