Question

If AB is an object and A'B' is an image formed, then match the following.

• A. 1 - A, 2 - C, 3 - A, 4 - B
• B. 1 - D, 2 - C, 3 - A, 4 - B
• C. 1 - A, 2 - C, 3 - B, 4 - D
• D. 1 - C, 2 - A, 3 - A, 4 - B

Answer 1

The correct option is B

1 - D, 2 - C, 3 - A, 4 - B

1)

⇒Since image height = object height,

⇒So object must be kept at 2$F_1$.

2)

⇒Since image height < object height so

⇒The object must be kept beyond 2$F_1$

3)

⇒ Since image and object is at same side. So, the only possibility is object kept between focus and optical centre.

4)
⇒Since image height > object height and image is inverted.

⇒So, object must be kept between 2$F_1$ and $F_1$.