Resolving power of electron microscope is proportional to

de Broglie wave length λ=hp  where p = momentumResolving power (R) of electron microscope = =2μ sinθλ=2μ sinθh/p⇒R=2(NA).ph,where μ = refractive index of the medium between the object and objective of the microscope, θ is the angle subtended by the radius of the objective at any one object and p is the momentum of electron.