Question

*At what distance does an object have to be placed in order to obtain the real image with the size same as an object with the help of convex lens?*

1️⃣ F1
2️⃣ Optical centre
3️⃣ 2F1
4️⃣ 2F2​

Answer 1

Step-by-step explanation:

The 3rd option is correct

2F1

Answer 2

The correct answer is option (3) 2F₁.

• At 2F₁ distance does an object have to be placed in order to obtain the real image with the size same as an object with the help of convex lens.
• At twice the focal length, the image formed by the convex lens is real and of the same size as the object.
• For example- If the lens has a focal length of 20 cm, the object must be positioned 40 cm in front of the lens, creating an inverted image of the same size as the target, 40 cm behind the lens.