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CBSE Class 12-science Answered

Find the intensity of a laser beam of 1mW power and having a diameter of 1.4 mm. Assume the intensity to be uniform across the beam.
Asked by shivamg86041 | 22 Dec, 2020, 03:56: PM
answered-by-expert Expert Answer
Intensity = Power per unit area
 
Intensity = 1 mW / [ π × 0.7 × 0.7 × 10-6 ] = 10-3 / [ π × 0.7 × 0.7 × 10-6 ] 
 
Intensity = 1000 / [ π × 0.7 × 0.7 ]  = 650 W/m2 
Answered by Thiyagarajan K | 22 Dec, 2020, 04:33: PM

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