an objectis placed on the principle axis of a concave lens at a distance of 20 cm from it.if the focal length of the lens is also 20 cm,find the location of thr image
Answers
Answered by
1
Object position (u) = - 20 cm (-ve sign due to position of object opposite to direction of incident ray)
Focal length (f) = -20 cm (focal length of concave mirror is always negative)
Mirror formula
1/f = 1/u + 1/v
-1/20 = -1/20 + 1/v
1/v = -1/20 + 1/20
1/v = 0
v = infinite ( not defined)
Focal length (f) = -20 cm (focal length of concave mirror is always negative)
Mirror formula
1/f = 1/u + 1/v
-1/20 = -1/20 + 1/v
1/v = -1/20 + 1/20
1/v = 0
v = infinite ( not defined)
Attachments:
parambhanderi:
ya
Similar questions