For the triangle shown at below, what is the angle theta in radians and in degre

Question

For the triangle shown at below, what is the angle theta in radians and in degrees? What would be your answers if you made the small angle approximation (sin theta approx tan theta approx theta)? What would be your % error in theta if you made the small angle approximation? Why is it OK to stare at a 100 watt light bulb, considering that a 0.001 watt laser aimed into your eye will damage it? (Try to answer beyond just "it's brighter" or "it's more damaging", we are curious how you would explain why? After all, the laser power is 100,000 times smaller, how might a physicist explain this apparently curious fact?)

Explanation / Answer

1) tan(theta) = 0.04/1 => theta = 2.29061o = 0.03998 rad

2) theta = 0.04 rad

% error = (0.04 - 0.03998)x 100/0.03998 = 0.05331%

3) as the main role in damaging is of the intensity..intensity of laSER is very high also the raysare infrared.

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