Physics, asked by sakshisingh1208, 1 year ago

At what distance the object should be placed so that the image will be formed at a distance 10 cm from a concave lens? Focal length of the lens is 20 cm.

Answers

Answered by RakaChoudhury
2
Given distance of image (v)=10cm
           focal length(f)=20cm
           distance of object(u)=???

1/f = 1/u + 1/v
or 1/20 = 1/u + 1/10
 or 1/u = 1/20 - 1/10 = 1-2/20 =  -1/20
or u= -20

Since u is negative, it should be placed infront of the mirror at a distance of 20cm 
Answered by sunandajadhav8840
1

Answer:

-20

the image formed by concave lens is virtual

please follow me.....

Attachments:
Similar questions