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

Why can you not use a concave mirror as a rear-view mirror in vehicles?

An object is placed at a distance of 15 cm. from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

What is the difference between a real image and a virtual image? Give one example of each type of image.

“A concave mirror of focal length ‘f’ can form a magnified erect as well as an inverted image of an object placed in front of it.” Justify this statement stating the position of the object with respect to the mirror in each case for obtaining these images.

A convex lens is immersed in a liquid of refractive index greater than that of glass. How will the nature of lens change?

Define and show on a diagram, the following terms relating to a concave mirror:

1. Aperture.
2. Radius of curvature.

A star appears slightly higher (above) than its actual position in the sky illustrate it with the help of a labelled diagram.

An object is placed at a distance of 6cm from a convex mirror of focal length 12cm. Find the position and nature of the image.

A doctor has prescribed a corrective lens of power, -1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging?