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  4. A narrow, paraxial beam of light is converging towards a point I on a screen. A plane parallel plate of glass of thickness t, and refractive index μ is introduced in the path of the beam. The convergence point is shifted by

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Q. A narrow, paraxial beam of light is converging towards a point I on a screen. A plane parallel plate of glass of thickness $t$, and refractive index $\mu$ is introduced in the path of the beam. The convergence point is shifted by

Ray Optics and Optical Instruments

Solution:

Longitudinal shift is given by $t-\frac{t}{\mu}$.
Hence, point of convergence shifts by the same amount.