Physics - Wave Optics Question with Solution | TestHub

A ray of light of intensity I is incident on a parallel glass slab at point $A$ as shown in diagram. It undergoes partial reflection and refraction. At each reflection, $25\%$ of incident energy is reflected. The rays $\mathrm{AB}$ and ${\mathrm{A}}^{\prime }{\mathrm{B}}^{\prime }$ undergo interference. The ratio of ${\mathrm{I}}_{\max }$ and ${\mathrm{I}}_{\min }$ is :