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The anomalous $WW\gamma$ coupling is probed through $e\gamma\rightarrow \nuW$ at the ILC. With a spectacular single lepton final state, this process iswell suited to study the above coupling. Cross section measurements can probe$\delta \kappa_\gamma$ to about $\pm 0.004$ for a luminosity of 100 fb$^{-1}$at $500$ GeV center-of-mass energy with unpolarized electron beam. The limitsderivable on $\lambda_\gamma$ from the total cross section are comparativelymore relaxed. Exploiting the energy-angle double distribution of the secondarymuons, kinematic regions sensitive to these couplings are identified. Thederivable limit on $\lambda_\gamma < 0$ could be improved to a few per-mil,focusing on such regions. More importantly, the angular distributions at fixedenergy values, and energy distribution at fixed angles present very interestingpossibility of distinguishing the case of $\lambda_\gamma <0$ and$\lambda_\gamma \ge 0$.

Probing $WW\gamma$ coupling through $e^- \gamma \rightarrow \nu_e W^-$ at ILC