For the refraction of light through a prism

A concave lens is placed in the path of a uniform parallel beam of light falling on a screen as shown. Then

A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate with the curved surface downwards. Monochromatic light is incident normally from the top. The observed interference fringes from this combination do not follow one of the following statements.

In figure shown $AB$ is a plane mirror of length $40 \mathrm{cm}$ placed at a height $40 \mathrm{cm}$ from the ground. There is a light source $S$ at a point on the ground. If the minimum height is $p \mathrm{cm}$ and maximum height is $q \mathrm{cm}$ of a man (eye height) required to see the image of the source if he is standing at a point $A$ on the ground as shown in figure, then find the ratio $\frac{q}{p}$

Two concave mirrors each of radius of curvature $40 \mathrm{cm}$ are placed such that their principal axes are parallel to each other & at a distance of $1 \mathrm{cm}$ to each other. Both the mirrors are at a distance of $100 \mathrm{cm}$ to each other. Consider first reflection at $M_1$ and then at $M_2$, the final coordinates of the image thus formed are $\left(x,-y\right)$, then find $\frac{x}{y}$. Take location of object as the origin.