An object is placed between f and 2f of a convex lens. Which of the following statements correctly describes its image ? a real, larger than the object c inverted, same size as object
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Answer
Hint: To understand what happens when an object is placed between F and 2F we have to draw the ray diagram. Placing the object at different positions will enable us to understand how the size of the image varies with the object. If the object is placed at the focus, the image will be formed at infinity and the object is placed at 2F the image will be formed at 2F on the other side of the lens.
Complete answer:
To begin with let us draw the ray diagram placing the same object but at two different positions at between F and 2F.
So, the correct answer is “Option d”.
Note:
In ray optics the distance is always measured from the optical centre to any given point. The distance measured is taken as negative if the path traversed from the optical centre to a given point is in the opposite direction to that of the incident ray. The magnification formula for a convex lens has a minus sign which indicates that the object is inverted.