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Question

A concave refractive surface of a medium having refractive index μ produces a real image of an object (located outside the medium) irrespective of its location. Choose the correct option from the following

A
Always
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B
May be if refractive index of surrounding medium is greater than μ
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C
May be if refractive index of surrounding medium is less than μ
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D
None of the above
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Solution

The correct option is C May be if refractive index of surrounding medium is less than μ
R=R ; u=u then , v<0

μ2vμ1u=μ2μ1R

1V=μ1R+1u

for μ>1 i.e, greater than outside medium then it would always form a real image

option C is correct

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