Home Physics Ray Optics Mix A concave spherical surface of radius of cur…
Physics Ray Optics Mix MCQ (Single Correct)

A concave spherical surface of radius of curvature 10 cm separates two mediums X and Y of refractive indices 4/3 and 3/2 respectively. Centre of curvature of the surface lies in the medium X. An object is placed in medium X.

A
Image is always real
B
Image is real if the object distance is greater than 90 cm.
C
Image is always virtual
D
Image is virtual only if the object distance is less than 90 cm.

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The correct answer is:
C

Let there be two point objects O 1 and O 2 , Incident rays from O 1 and O 2 at point P shall both bend towards normal and hence the corresponding refracted rays shall intersect the principal axis in the left medium. Therefore image formed under given condition shall always be virtual.

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