Question

In an experiment to determine the focal length of a concave mirror by the $ u-v$ method, a student places the object pin $ A$ on the principal axis at a distance of $ x$ from the pole $ P$. The student looks at the pin and its inverted image from a distance keeping his/her eye in line with $ PA$. When the student shifts his/her eye towards the left, the image appears to the right of the object pin.

• A. $x<f$
• B. $f<x<2f$
• C. $x=2f$
• D. $x>2f$

Answer 1

The correct option is B

$f<x<2f$

Mirror

1. There are three types of mirrors that are commonly utilized.
2. Plain, concave, and convex mirrors are available. All of them will have various functions. Various mirrors have different properties.
3. Virtual pictures are always formed by convex mirrors.
4. Plain mirrors create virtual pictures.
5. While concave mirrors create both virtual and real images. In the sense that it is real, it is an inverted image.

Focal length of a concave mirror

1. When an object is put between the concave mirror's pole and focus, an image is generated on the opposite side of the mirror. That image can be virtualized and enlarged or decreased.
2. When objects are placed between the focus and the center, the image is produced distant from the center and is genuine and inverted.
3. The image will be larger than the object. Demonstrating with the help of a diagram.
4. The image generated will be between the center and focus if the object is placed away from the center. That image will be actual, reversed, and scaled-down.
5. Given that the image is inverted and that if the item moves left, the image moves right, it must have fallen somewhere between center and focus. Therefore, $f<x<2f$

Hence, option B is the correct answer.