1- A 1.8 mW helium-neon laser beam delivers a
spot of light 8 mm in diameter across a room 17 m...

Question

1- A 1.8 mW helium-neon laser beam delivers a
spot of light 8 mm in diameter across a room 17 m wide. The beam radiates
from a small circular area of diameter 0.5 mm at the output mirror of the
laser. Assume irradiance is constant across the diverging beam. What is the
radiance (in SI units) of the laser? Give your answer to 3 significant figures.2-A small monochromatic light source, radiating
at 455 nm, is rated at 992 W. If the source radiates uniformly in all directions,
determine its radiant intensity in SI units. Give your answer to 1 decimal
place.

David · Accepted Answer

1- A 1.8mW helium-neon laser beam delivers a spot of light 8mm in diameter across a room 17m wide. The beam 
radiates from a small circular area of diameter 0.5mm at the output mirror of the laser. Assume irradiance is constant 
across the diverging beam. What is the radiance (in SI units) of the laser? Give your answer to 3 significant figures. 
Answer 
Power of Laser = 1.

1- A 1.8 mW helium-neon laser beam delivers a spot of light 8 mm in diameter across a room 17 m wide. The beam radiates from a small circular area of diameter 0.5 mm at the output mirror of the laser....

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