Problem: An object is located 30.0 cm from a certain lens. The lens forms a real image that is twice as high as the object. What is the focal length of this lens? a. 90 0 cm b. 10.0 cm c. 5.00 cm d. 20.0 cm

FREE Expert Solution

Lens equation:

1f=1so+1si

Magnification:

m=hiho=-siso

m = hi/ho = 2

For a real image, distance is negative.

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Problem Details

An object is located 30.0 cm from a certain lens. The lens forms a real image that is twice as high as the object. What is the focal length of this lens? 

a. 90 0 cm 

b. 10.0 cm 

c. 5.00 cm 

d. 20.0 cm