The diagram shows a spherical surface wh...

The diagram shows a spherical surface which separates two media of refractive index, `mu_(1) and mu_(2)`. Respectively. Now, a point object is placed on the principal axis as shown in the figure. Then

Real image will form if `mu_(1) gt mu_(2)` and for all values of u

Real image for some values of u if `mu_(1) gt mu_(2)`

Virtual image will form if `mu_(1) gt mu_(2)`

Virtual image will form if `mu_(1) lt mu_(2)`

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