The correct answer is: B. Ultraviolet radiations from Sun burn our retina.
The Sun emits a lot of different types of radiation, including visible light, infrared light, ultraviolet light, and X-rays. Of these, ultraviolet light is the most harmful to our eyes. Ultraviolet light can damage the retina, the light-sensitive tissue at the back of the eye. This damage can lead to vision problems such as cataracts, macular degeneration, and blindness.
When the Sun is blocked by the Moon during a solar eclipse, the amount of visible light
that reaches Earth is greatly reduced. However, the amount of ultraviolet light that reaches Earth is not reduced as much. This is because ultraviolet light is scattered less than visible light by the Earth’s atmosphere. As a result, it is still possible to suffer eye damage from looking at the Sun during a solar eclipse, even if you are wearing sunglasses.If you want to safely observe a solar eclipse, you should use a special solar eclipse viewer or eclipse glasses. These devices filter out all of the harmful ultraviolet light from the Sun. You should never look directly at the Sun, even during a solar eclipse, without proper eye protection.
Here is a brief explanation of each option:
- Option A: Infrared radiations from sun burn our retina. This is not the correct answer because infrared radiation is not as harmful to our eyes as ultraviolet radiation.
- Option B: Ultraviolet radiations from Sun burn our retina. This is the correct answer because ultraviolet radiation is the most harmful type of radiation from the Sun.
- Option C: All radiations from sun initiate chemical reactions in eyes. This is not the correct answer because not all radiations from the Sun are harmful to our eyes. Only ultraviolet radiation is harmful to our eyes.
- Option D: Cosmic rays reach eyes more during the eclipse. This is not the correct answer because cosmic rays are not as harmful to our eyes as ultraviolet radiation.