Consider three geometrically identical concave lenses A, B and C. A is made of material of refractive index `mu_(1)`, B is made of material of refractive index `mu_(2)`. Lens C is constructed in such a way that half of the lens above principal axis is made of material of refractive index `mu_(1)`, and half of the lens below principal axis is made of material of refractive index `mu_(2)`. Image of an object O as shown in figure is formed at `I_(1)` when lens A is used and the image is formed at `I_(2)` when lens B is used at the same location. Now the lens C is placed at the same location.

Options

A. One image will be at `I_(1)`
B. One image will be at `I_(2)`
C. One image will be formed somewhere between `I_(1)` and `I_(2)`
D. One image will be formed between `I_(2)` and the lens

Answer

A, B

Explanation

Light rays travelling above the principal axis will form one image at `I_(1)` and light rays travelling below the principal axis will form image at `I_(2)`. Only options (a) and (b) are correct. C4.