When we get totally black line spectrum

1.	When we get totally black line spectrum
Answer» Agr hm lymenn ki baat kre toh uv rays hoti h usme ....uske spectrum m bhi black region aata h ....or vo black region bhi visible h...aesa hi case infrared rays m bhi milta h<br>Mujhe aisa esliye lagta hai kyoki black bhi ek colour hai jisko hum dekh sakte hai.... So entire hydrogen spectrum mai ek balmer series hi hai jo ki visible hai ... Sooo... Ager abhi bhi doubt hai toh I m sry ....<br>Aap itna btae aapko kyu lgta h aesa<br>Agr pta hota toh puchti hi kyu..<br>Mere ko toh ye hi lagta hai, if there is better ans. Then plz tell<br>?<br>Visible h toh black spectrum....ye kya logic hua<br>I think in Balmer series bcoz there the lines are visible

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