Lab Activity: Focal Length of a Concave Mirror With Image Distance v and Object Distance u

Cotyledons are also called-

A student took an observation and found that the distance of the image pin is equal to $40 \mathrm{cm}$ and the distance of the object pin is equal to $24 \mathrm{cm}$ from the pole of the concave mirror. Which one of the following formulae and the values must be used for calculations?

Why Index correction is required while finding the focal length of a concave mirror?

Which one of the following is the correct position of the object pin to find the focal length of a concave mirror?

Why is it important to make sure the optical bench's center line and the mirror's major axis are parallel when determining  v values for various values of u and the focal length in the case of a concave mirror?

As shown, in a lab experiment, a student makes a graph based on his observations. In the u-v graph for a concave mirror, he drew lines OA, AB, and AD. what is the significance of point A?

How are the values of $u$ and $v$ represented at point A on the $u-v$ graph for a concave mirror?

In an experiment of finding focal length of a concave mirror by u-v method, a student prepares following graph of u versus v graph. 

Focal length of mirror is nearly

A concave mirror lab experiment being conducted by a student. What should he adjusted to obtain a clear, sharp image on the screen in front of the concave mirror?