Mirror formula is :

Correct option is D

The correct answer is: (D) $$\frac{1}{f}= \frac{1}{u} + \frac{1}{v}$$​

Explanation:

The mirror formula is an important equation in optics that relates the object distance uu, the image distance vv, and the focal length ff of a mirror. The formula is given as:

​$$\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$$​​

This equation is used to calculate the relationship between the distances of the object and the image from the mirror, where:

• u is the object distance (distance from the mirror to the object),

• v is the image distance (distance from the mirror to the image),

• f is the focal length of the mirror.

Information Booster:

• The mirror formula is used for both concave and convex mirrors.

• It helps to find the position of the image formed by the mirror.

• The sign convention for distances is important when using this formula: for a concave mirror, the object distance is negative if the object is in front of the mirror, and the image distance is positive if the image is real.

• The mirror formula is derived from the lens formula, as both deal with the relationships between focal length, object distance, and image distance.

• For real images, the image distance v is positive, while for virtual images, v is negative.