 Question number seven we wish to obtain an erect image of an object using a concave mirror So beta remember for a con the cave a the mirror a we have Six cases five cases from real and inverted image one case from virtual and erect image as they need an erect image That has to be this case where the object should be placed between focus and pull Yeah, so The mirror is of 15 centimeter focal length so the object distance should be Less than 15 centimeter. Anyway, it will be negative