(a) Object is closer to the lens than F (u < ƒ)

• Magnifying glass

(b) Object is at the focal point F (u = ƒ)

• Theatre spot light

(c) Object is between F and 2F (ƒ< u < 2ƒ)

• Classroom projector
• Cinema film projetor

(d) Object is at 2F (u = 2ƒ)

• Photocopier

(e) Object is beyond 2F (2ƒ< u < ∞)

• Camera
• Human eye

(f) Object is at infinity (u = ∞)

• Telescope
• Binoculars

 

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