Why can you watch the solar eclipse with the bottom of a beer bottle? It can be dazzling.

Because the bottom of beer bottle can prevent strong light from hurting eyes and play a "filtering role".

When you look through the bottom of a beer bottle, some light will be absorbed. You can't observe the total solar eclipse directly at the sun with the naked eye. If there is no special solar filter, the transparent object watching the solar eclipse with the bottom of the beer bottle can absorb some light.

Extended data:

Matters needing attention when removing the bottom of beer bottle:

Watching the solar eclipse with the bottom of a beer bottle can avoid strong light from hurting your eyes. The bottom of beer bottle is equivalent to a concave lens, which has the function of diverging light.

Wrap the cotton thread dipped in kerosene and other fuels around the bottom to be cut once or twice, ignite the cotton thread, and quickly soak the bottom in cold water after the cotton thread burns, so that the bottom of the wine bottle can be removed once or more.

However, this method is difficult to operate. It is recommended to use fuel, and the incision of the wine bottle is sharp, so pay attention to safety.