Nothing causes instant damage. (See Into the Sun for an interesting take on it) The question then comes, how much exposure will damage your eyes. The Straight Dope has a very good article on this: Can laser pointers damage your eyes? As does Scientific American: Can a pocket laser damage the eye? The big take is that (until recently) the most powerful laser pointers available would cause you to blink before it would do damage to your eyes (about 0.25s).
Importance of the sun. - Sun = ultimate source of E for all organisms-The energy from sunlight is stored in the chemical bonds of molecules. - When these bonds are broken, energy is released-Same for all fuel sources (food, fossil fuel, biofuel).
Because it is a cleaner source of power than oil or coal, nuclear energy is often mistakenly referred to as a renewable resource. The sources of the energy that people use the world over fall into two general categories: renewable and nonrenewable.While the supply of renewable resources, such as sunshine and wind, is virtually limitless, nonrenewable resource supplies are finite.Some nonrenewable resources, including oil and coal, are the product of millions of years of conversion from fossils, the buried remains of ancient plants and animals.ecause it is a cleaner source of power than oil or coal, nuclear energy is often mistakenly referred to as a renewable resource. The sources of the energy that people use the world over fall into two general categories: renewable and nonrenewable.