Question

1. An object is placed at 2F position of a convex lens. Draw a ray diagram showing the formation of the image.
2. How will the size of the image change if we, ONLY replace the lens in the above arrangement with another lens of a greater focal length?

Answer 1

1. 
   
2. If we merely replace the given lens with another lens of longer focal length, then the new position of the object would lie between F₁ and 2F₁, and the size of the picture obtained would be magnified.