When an object moves towards a convex lens from beyond 2F upto F, the size of the image _____________. (a) decreases (b) increases (c) remains the same (d) first decreases then increases
As the angle between two plane mirrors is decreased gradually, the number of images of an object placed between them:
(a) increases gradually
(b) decreases gradually
(c) first increases then decreases
(d) first decreases then increases