Draw ray diagrams showing the image formation by a concave lens when an object is placed: At the focus of the lens.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:At infinity.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:
Between pole and focus of the mirror.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:
At centre of curvature of the mirror.

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.
Object is placed between device and its focus, image formed is enlarged and behind it.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:Between focus and centre of curvature of the mirror.

Draw ray diagrams showing the image formation by a convex lens when an object is placed:Between focus and twice the focal length of the lens.

Draw ray diagrams showing the image formation by a convex lens when an object is placed:At twice the focal length of the lens.

A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason.

Draw ray diagrams showing the image formation by a concave lens when an object is placed: Beyond twice the focal length of the lens.