An object of length 2.5 cm is placed at a distance of 1.5 f from a concave mirror where f is the magnitude of the focal length of the mirror. The length of the object is perpendicular to the principal axis. Find the length of the image. Is the image erect to inverted?

Options

A. 5 cm, erect
B. 10 cm, erect
C. 15 cm, erect
D. 5 cm, inverted

Answer

4

Explanation

By using `1/O=f/(f-u)` , where I =?, O = + 2.5 cm. `f to -f`, u = -1.5f
`therefore 1/(+2.5)=(-f)/(-f-(-1.5f))implies I=-5cm` (Negative sign indicates that image is inverted.)