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  4. A beam of light is converging towards apoint I on a screen. A plane glass plate whose thickness in the direction of the beam =t, refractive index =μ, is introduced in the path of the beam. The convergence point is shifted by

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

Ray Optics and Optical Instruments

Solution:

Normal
image
shift $\Delta x=\left(1-\frac{1}{\mu}\right) t$ and shift takes place in direction of ray.