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Two thin similar watch glass pieces are...

Two thin similar watch glass pieces are joined together,front to front ,with near convex portion silvered and the combination of glass pieces is placed at a distance `a=60cm` from a screen.A small object is placed normal to the optical axis of the combination such that its image is two time the object. Now water is filled in between the glass. water`mu=4//3`,calculated the distance through,which the object must be displayed so that a sharp image is again formed on the screen.

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15 cm towards the combination
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Two thin similar watch glass pieces are joimed together,front to front ,woth near convex portion silvered and the combination of glass pieces is placed at a distanc e a=60cm from a screen.A small object is placed normal to the optical axis of the combination such that its two water mu=4//3 ,calcuated the distance through,which the object must eb displayed so that a sharp image is again formed on the screen.

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