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InterviewSolution
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A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness `3cm` and refractive index `1.5` is placed over the mark. How should the microscope be moved to get the mark in focus again ?A. 2 cm upwardB. 1 cm upwardC. `4.5` upwardD. 1 cm downward |
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Answer» Correct Answer - B Here, real depth of mark, `x = 3 cm` apparent depth of mark, `y = ?` refractive index, `mu = 1.5` As `mu = (x)/(y) :. y = (x)/(mu) = (3)/(1.5) = 2 cm` Distance through which mark appears to be raised = `x - y = 3 - 2 = 1 cm` `:.` To get the mark in focus again, distance through which microscope be moving upwardsd `= 1 cm`. |
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