1. What is the definition of the focal length of a converging lens? Illustrate y

Question

1. What is the definition of the focal length of a converging lens? Illustrate your answer with a diagram.

2. Show that... | di / do | = | hi / ho |

3. Consider a lens with a focal length of f=10.0 cm which is used to image an object of height ho=2.0 cm, and a distance do=20.0 cm away. On graph paper, draw a diagram showing the size (hi) and position (di) of the image formed by this lens. Check that the value of di obtained from your graph agrees with a calculation of di made by equation [1].

** Equation [1] --> (1 / f ) = ( 1 / do ) + ( 1 / di )

Explanation / Answer

1.

Focal length is the distance between the center of a convex lens and the focal point of the lens i.e the point where parallel rays of light meet or converge.

3)

1/f = 1/d0+1/di

1/di = 1/f -1/d0

1/di = 1/10 -1/20

di = 20 cm

hi/h0 = di/d0

hi/2 = 20/20

hi = 2cm

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