Where is the peak magnitude of the electric field higher?Where is the peak magni

Question

Where is the peak magnitude of the electric field higher?Where is the peak magnitude of the electric field higher? In the center of a 20 mW laser beam with 1mm diameter, at a wavelength of 450 nm (assume the intensity is uniform across the entire beam and zero everywhere else). 1 A (= 10 "' m) away from the center of a proton. The peak electric fields in cases a and b are the same to within a factor of 10. You apply a material with n 1.25 to a lens (ng - 1.50) to make a nonreflective coating due to destructive interference at a wavelength (in a vacuum) of 555 nm. What is the minimum thickness of the coating that is needed?

Explanation / Answer

the electric field is highest near the nucleus , answer is b

and 555 * (1.5-1.25 ) = 138.75 nm

hence minimum of 139 nm is needed. answer is c

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