U Uranusmercury New member Feb 7, 2011 #1 A convex lens of focal length 800mm is used to form a real image of the moon on a screen. If the moon subtends an angle of 0.5 degree to an observer on earth, calculate the size of its image formed on the screen.
A convex lens of focal length 800mm is used to form a real image of the moon on a screen. If the moon subtends an angle of 0.5 degree to an observer on earth, calculate the size of its image formed on the screen.