A convex lens is also known as converging lens.

When a drop of water is introduced between the glass plate and plano convex lens in Newton's rings system, the ring system:

Which of the following lenses would you prefer to use while reading very small letters?

An object is placed between the optical centre and the focus of a thin convex lens. What is the nature of the image of the object?

Four bulbs; red, green, white and blue (denoted by $R, G, W$ and $B$ respectively) are kept in front of a converging lens (as shown in the figure below). The observer sees that the green and blue bulbs are kept to the left of the principle axis while the red and white bulbs are kept to the right of the principle axis. He also sees that the red and green bulbs are above the principle axis while the white and blue bulbs are below the principle axis. The screens $S_1$ and $S_2$ are set at appropriate positions for the focusing to view the images.

Choose the figure that correctly represents the images as seen by the observer.

The word KVPY is written on $\mathrm{a}$ board and viewed through different lenses such that board is at a distance beyond the focal length of the lens.

Ignoring magnification effects, consider the following statements.
$\left(\mathrm{I}\right)$ First image has been viewed from the planar side of a plano-concave lens and second image from the planar side of a plano-convex lens.
$\left(\mathrm{II}\right)$ First image has been viewed from the concave side of a plano-concave lens and second image from the convex side of a plano-convex lens.
$\left(\mathrm{III}\right)$ First image has been viewed from the concave side of a plano-concave lens and second image from the planar side of a plano-convex lens.
$\left(\mathrm{IV}\right)$ First image has been viewed from the planar side of a plano-concave lens and second image from the convex side of a plano-convexlens.

Which of the above statements are correct?