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We performed optical simultaneous dual-band (SDSS $g'$- and $i'$- band)photometry and low-resolution spectroscopy for the WZ Sge-type dwarf nova EZLyn during its 2010 superoutburst. Dual-band photometry revealed that the$g'-i'$ color reddened with a decrease in brightness, during the mainsuperoutburst and the following rebrightening phase, whereas the color becamebluer with a further decrease in brightness during the slow, final declinephase. With a fit to our photometric results by a blackbody function, weestimated the disk radius ratio (ratio of the disk radius to the binaryseparation) and compared this with that of V455 And, a WZ Sge-type object thatdid not show any rebrightening in the 2007 superoutburst. The comparisonrevealed: (1) the disk radius ratio of EZ Lyn decreased more slowly than thatof V455 And; and (2) the radius ratio of EZ Lyn at the end of the mainsuperoutburst was larger than that of the V455 And. These results favor themass reservoir model for the mechanism of rebrightening. During both thesuperoutburst plateau and subsequent rebrightening phase, H$\alpha$ andH$\beta$ lines were detected. The H$\alpha$ line showed a double-peak profilefrom which we estimated the disk radius ratio. The comparison of this ratiowith that derived by photometry, indicates that the H$\alpha$ disk was largerthan the photometric one, which suggests that the optically thin gas wasextended to the outer region more than the optically thick gas disk and waspossibly responsible for the rebrightening phenomenon. Time-series dual-bandphotometry during the main superoutburst revealed that color variations duringthe early superhump show roughly the same behavior as that of V455 And, whereascolor variations during the ordinary superhump display clear anticorrelationwith brightness, in contrast to that seen in the V455 And.

Optical Dual-Band Photometry and Spectroscopy of the WZ Sge-Type Dwarf Nova EZ Lyn during the 2010 Superoutburst