List of top Physics Questions on Lenses asked in ICSE Class X board

An object placed in front of a convex lens, forms an image of same size on a screen. Moving the object 12 cm closer to the lens results in the formation of a real image which is three times the size of the object. Calculate the focal length of the lens.
What would be the magnification (more than 1 / less than 1 / equal to 1) if the object is placed between F and 2F of the above lens?
The graph below shows the variation of image distance (v) with the object distance (u) when an object is kept in front of a lens. Identify the type of lens used.
The distance (v) of a virtual image formed by a lens of focal length 15 cm can never exceed a certain finite value, then this value will be: