for a glass lens (n=1.50), the focal length in the air is 10 cm and an object places on one side of it creates an image that is smaller and separated from the object by a distance of 90cm
a) describe fully the image (position, type, magnification) the lense and the object are then placed under water (n=1.33) without changing the distance between them
b) find the new position of the image and fully describe it.