Question

Solve this....
A laser light beam of power 20 mW is focused
on a target by a lens of focal length 0.05 m. If the aperture of
the laser be 1 mm and the wavelength of its light 7000 Å
calculate the angular spread of the laser, the area of the target
hit by it, and the intensity of the impact on the target......NO SPAMS.....WRONG ANS WILL BE REPORTEDDD!!!!!​

Answer 1

Answer:

pls follow and like me pls

Answer 2

Explanation:

Given A laser light beam of power 20 m W is focused  on a target by a lens of focal length 0.05 m. If the aperture of  the laser be 1 mm and the wavelength of its light 7000 Å  calculate the angular spread of the laser, the area of the target  hit by it, and the intensity of the impact on the target.  

• Given P = 20 mW = 20 x 10^-3 W
• Focal length f = 0.05 m, d = 1 mm = 1 x 10^-3 m, λ = 7000 A = 7000 x 10^-10 m, theta = 7 x 10^-4 radians
• Linear speed of the laser s = f x theta
•                                             = 0.05 x 7 x 10^-4
•                                             = 0.35 x 10^-4 m
• Now area of target hit by laser = s^2
•                                                    = (0.35 x 10^-4)^2
•                                                    = 0.1225 x 10^-8
•                                                    = 1.225 x 10^-9 sq m
• So intensity of impact on the target = power of the laser beam / area hit by the laser beam.
•                                                         = 20 x 10^-3 / 1.225 x 10^-9 W / m^2
•                         = 16.326 x 10^6 W/m^2
•                         = 1.632 x 10^7 W / m^2

Reference link will be

https://brainly.in/question/12362325