A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness $$3$$ cm and refractive index $$1.5$$ is placed over the mark. How should the microscope be moved to get the mark in focus again?

Question

Infinity Learn · Accepted Answer

Apparent depth of mark as seen through a glass slab of thickness x and refractive index µ isApparent  $$depth=Real$$  depthRefractive  indexor   x'$$=x$$μ$$=31.5=2$$  cmAs  image  appears  to  be  raised  by  $$1$$  cm,  therefore  microscope  must  be  moved  upward  by  $$1$$  cm.

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?

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