Magnification and nature of image

Example 1 · level 1

An object is 60 cm from a convex mirror; the image is formed at v = +15 cm (sign convention applied). Find the magnification m, with sign (correct to 2 decimal places).

Example 2 · level 2

An object is 90 cm from a concave mirror; the image is formed at v = −45 cm (sign convention applied). If the object is 4 cm tall, find the height of the image in cm, with sign (correct to 2 decimal places).

Example 3 · level 3

An object is 25 cm from a convex lens; the image is formed at v = −150 cm (sign convention applied). Describe the image.

1. Virtual, erect and enlarged
2. Virtual, erect and diminished
3. Real, inverted and diminished
4. Real, inverted and enlarged