Two lenses of optical powers 2D and -4D are placed in contact, find the focal length of this combination. what is the nature of this combination?
Answers
Answered by
1
Answer:
Focal length for each lens is
Power of lens A = +2D
Power of lens B = -4 D
Lens A is convex; f =+50 cm; Lens B is concave ; f =- 25 cm
Net focal length =50+(-25) =25cm
The image is larger than the object as long as the object is between 1 and 2 focal lengths away from the lens.
Similar questions