What is the value of refractive index

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Q. A concave mirror is of hemisphjerical shape with radius 40cm. A thin layer of unknown transparent liquid is poured into mirror. The mirror liquid forms a real image and another real image is formed by the mirror alone. One of them coincides with object and other is at a distance 20 cm from the object in the direction away from mirror.

What is the value of refractive index?

Reference no: EM1369238

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