Consider a vernier calipers in which each $1 \mathrm{cm}$ on the main scale is divided into $8$ equal to divisions and a screw gauge with $100$ divisions on its circular scale. In the vernier calipers $5$ divisions on the vernier scale coincide with $4$ divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then,

There are two Vernier calipers both of which have $1 \mathrm{cm}$ divided into $10$ equal divisions on the main scale. The Vernier scale of one of the calipers $\left({\mathrm{C}}_1\right)$ has $10$ equal divisions that correspond to $9$ main scale divisions. The Vernier scale of the other caliper $\left({\mathrm{C}}_2\right)$ has $10$ equal divisions that correspond to $11$ main scale divisions. The readings of the two calipers are shown in the figure. The measured values (in $\mathrm{cm}$) by calipers ${\mathrm{C}}_1$ and ${\mathrm{C}}_2$, respectively, are

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance $u$ and image distance $v$, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of $45°$ with the $\mathrm{X}$-axis meets the experimental curve at $\mathrm{P}$. The coordinates of $\mathrm{P}$ will be