An object is viewed through a compound microscope and appears in focus when it is ${\rm{5 mm}}$ away from the objective lens. When a sheet of transparent material ${\rm{3 mm}}$ thick is placed between the objective and the microscope, the objective lens has to be moved ${\rm{1 mm}}$ to bring the object back into the focus. The refractive index of the transparent material is

JEE PHYSICS MCQ: RAY OPTICS

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An object is viewed through a compound microscope and appears in focus when it is

\mathrm{5 mm}

away from the objective lens. When a sheet of transparent material

\mathrm{3 mm}

thick is placed between the objective and the microscope, the objective lens has to be moved

\mathrm{1 mm}

to bring the object back into the focus. The refractive index of the transparent material is

View answer and explanation

Correct option: A

1.5

Option A (

1.5

) is correct because the refractive index is calculated using the formula for the shift in the object's position due to the transparent material.