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Please can anyone tell me is my screen broken

Yes, your display assembly is likely damaged. To be sure you’ll need to try an external display to see if it works and/or inspect the LVDS connector reference this guide MacBook Air 13" Early 2015 Display Assembly Replacement. Follow the guides first three steps disconnecting the battery. Then jump down to Steps 19 & 20 disconnecting the LVDS cable. Now inspect the logic board connector making sure you don’t see any corrosion on the solder joints and the connector.