All Problems

Interference of Light

Problem 5.90

Two plano-convex thin glass lenses are brought into contact with their spherical surfaces. Find the optical power of such a system if in reflected light with wavelength \(\lambda=0.60 \mu \mathrm{m}\) the diameter of the fifth bright ring is \(d=1.50 \mathrm{~mm}\).

Reveal Answer
Φ=2(n−1)(2k−1)λ/d2=2.4D, where k is the number of the bright ring\Phi=2(n-1)(2 k-1) \lambda / d^{2}=2.4 \mathrm{D}, \quad \text { where } \quad k \quad \text { is the number of the bright ring}
Prev
Next