You have a concave mirror of focal length 20 cm. You want to obtain a real image of double the size of the object on the screen. Where will you keep the object from the mirror?

Between centre of curvature and principal focus.

i think it would be 5

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation