No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be:

Where should an object be placed in front of a convex lens to get a real image of the size of the object ?

A spherical mirror and a thin spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be:

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

We wish to obtain an erect image of an object using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.