Question

In the case of a convex lens, when the object is beyond $2F,$the image is formed

• A. at infinity
• B. between $F$and $2F$
• C. beyond $2F$
• D. at $F$

Answer 1

The correct option is B

between $F$and $2F$

The explanation for the correct option(s):

1. A convex lens or converging lens is a type of lens which is thicker in the middle and thinner at the edges.
2. Option B: When an object is placed beyond $2F$ the light rays which are parallel to the principal axis of the lens (MN) will pass through the focus of the lens after refracted
3. Light rays which are passing through the optical center of the lens i.e O will pass through the lens without any deviation.
4. A real, diminished, and inverted image (B'A') of the object (AB) is obtained between $F$and $2F$ as shown in the diagram.
   

The explanation for the incorrect option(s):

1. Option A: When the object is at infinity a real, highly diminished, and inverted image forms at the focal point of the lens.
2. Option C: When the object is placed at $2F$a real, inverted, and the same size as the object image formed at the same position i.e at $2F.$
3. Option D: When the object is placed at $F$ a real, inverted, and enlarged image of the object forms at infinity

Hence, the correct answer is option B.