A converging lens is used to read the small print in a contract. The lens is held 9.0cm from the print and produces a magnification of +2.5. What is the focal length of the lens?
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Answer:
Converging Lens or convex lens is a type of lens that is curve on both sides allowing all the light that passes through the lens be focus on a point - converges of the focal point. This is also signifies by the positive value of the focal length
Explanation:
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Answer:
15cm
Explanation:
Magnification = +2.5
Lens = 9cm
Focal length = ?
→ m/u = +2.5/-9. [ Print is the object]
→m = v/u
→2.5 = v/-9
→ v = -22.5 cm
→1/v - 1/u = 1/f
→1/-22.5 - 1/-9 = 1/f
→ 1/f = 1/9 - 1/22.5 = 22.5 - 9 / 9× 22.5
→ 1/f = 13.5/9× 22.5 [divide them]
→ 1/f = 1/15
→ f = 15 cm
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