Question

HEY!!! PLZ ANSWER THIS...ASAP❤️
An object is placed at a distance of 20 cm from a concave lens of focal length 15 cm. Find the distance of the image from the lens and draw its ray diagram.​

Answer 1

Answer:

Given: Focal length, f=−20cm                 Image distance,  v=−15cm         (concave mirror)

To find: Object distance, u

From lens formula,

v1−u1=f1

−151−u1=20−1

201−151=u1

u=−60cm