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Why it is not safe to watch solar eclipse with naked eye?
During the eclipse, people should not watch the Sun in naked eyes.
Observing the Sun during eclipse can be dangerous if you do not take the proper precautions.
According to NASA, the solar radiation that reaches the surface of Earth ranges from ultraviolet (UV) radiation at wavelengths longer than 290 nm to radio waves in the meter range.
The tissues in the eye transmit a substantial part of the radiation between 380 and 1400 nm to the light-sensitive retina at the back of the eye.
The only time that the Sun can be viewed safely with the naked eye is during a total eclipse, when the Moon completely covers the disk of the Sun.
Only safe way to look directly at Sun is through special-purpose solar filters, such as eclipse glasses or hand-held solar viewers.
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