An object that emits bright light (such as a torch or Flaming Tongue) within heavily obscured. D&D 5e

What if a torch is providing bright light in a 20-foot radius and dim light for an additional 20 feet she would have only dim light 20 feet while in heavily obscured? Or would it also have bright light in a 20-foot radius on heavily obscured? Considering heavily obscured as moonless night. And would the Flaming Tongue work as in this same condition?

Does the light from a torch under the effects of a light cantrip blind? [on hold]

I just finished running a session that acted as a game of cat and mouse between by player party of level 4 characters and an ancient white dragon. It was basically a game of their cunning versus the dragon, and they had managed to escape without any casualties (aside from the Aasimar fighter’s leg). however, that Aasimar decided to try and blind the dragon by casting light on a torch and tossing that torch in the dragon’s face. I had ran it as the dragon flinching back, blinded. I’m not sure if that is the correct ruling and thought I would ask y’all. Does the light from a torch under the effects of a light cantrip blind?

thank you