A laser beam can be focused on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of 1 mW and its wavelength is 632.8 nm. The intensity of focused beam will be

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

1.5×1013 W/m2

2.5×109 W/m2

3.5×1017 W/m2

None of these

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Area through which the energy of beam passes=6.328×10−72=4×10−13m2∴ I=PA=10−34×10−13=2.5×109W/m2

Watch 3-min video & get full concept clarity