Question

the image of an object of formed by a lens of magnification -1.if the dustance between the object and its image is 60cm

Answer 1

Answer:

Explanation:

Hi,

Please find below the solution to the asked query:

The image of object formed by a lens cannot be - 1. Please check your question. If it is the magnification of image, Then correct answer is given below.

Given,

Magnification, m = -1

Distance between object and image, u + v = 60 cm

Magnification (m) is given by

m=vu⇒−1=vu⇒v=−um=vu⇒-1=vu⇒v=-u

Now, we have

Also,

− u + v = 60

⇒−u−u=60⇒−2u=60⇒u=−30 cm So, v=−(−30)=30 cm⇒-u-u=60⇒-2u=60⇒u=-30 cm So, v=--30=30 cm

Using lens formula

1v−1u=1f⇒1f=130−1−30=230⇒1f=115⇒f=15 cm 1v-1u=1f⇒1f=130-1-30=230⇒1f=115⇒f=15 cm

Hope this information will clear your doubts about the topic