Solve the following numericals Cany)
DA conver mirror has a focal length of 18 cm
The image of an object kept in
front of
of the mirror is half the height of the
obiect. what is the distance of the objet
from the mirror

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?