An object is placed at a distance of 30cm from a concave lens of focal length 15cm. List four characteristics (Nature, position. Etc.) of the image formed by the lens.

Question

Philoid · Accepted Answer

The data given is:

the object distance is, u = -30 cm.,

the focal length is, f = -15 cm,

we know that the mirror formula is,

, where,

v is the image distance, u is the object distance, and f is the focal length of the mirror, here as the mirror is concave, so the focal length is negative (-30 cm).

Calculations:

So, after substituting the data we have,

So, we get v = -30 cm.

Finally, by looking at the ray diagram we observe that the image is real as the image distance is found to be negative, also the image is inverted and is formed on the sample where is object is kept.