ERECT

Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively

A Galilean telescope obtains the erect final image by using a diverging lens of focal length 7.5 cm instead of an intermediate erecting lens. If the focal length of the objective is 150 cm, what is the separation between the objective and the eyepiece?