Object is placed at a distance of 75cm from a screen . where should a convex lens of focal length 12 cm be placed so as to obtain real image of object
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focal length f =+12
object distance u = -75
image distance v =?
using lens formula
1/v - 1/u = 1/f
1/v = 1/u + 1/f
1/v = 1/(-75) + 1/12
1/v = - 1/75 + 1/12
1/v = -4 + 25/300
= -21/300
v= 14. 3
object distance u = -75
image distance v =?
using lens formula
1/v - 1/u = 1/f
1/v = 1/u + 1/f
1/v = 1/(-75) + 1/12
1/v = - 1/75 + 1/12
1/v = -4 + 25/300
= -21/300
v= 14. 3
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