1- The focal length of a lens can be changed by changing the object distance. a-

Question

1- The focal length of a lens can be changed by changing the object distance.

a- true

b- false

2-An object 16.03 cm in front of a lens creates a sharp image 26.57 cm away from the lens. What is the focal length of the lens in cm?

3-In your experiment, an image is formed on a screen. You notice the object distance is greater than the image distance. Which of the following choices best describes the properties of the image?

Virtual, Smaller

Virtual, Larger

Real, Smaller

Real, Larger

4-An image is observed on screen to be 13.11 cm in length, and a magnification of -3.66. What is the object height?

5-A real object has a 10.54 cm length. A real image is observed with a 22.34 cm length. What is the magnification

Virtual, Smaller

Virtual, Larger

Real, Smaller

Real, Larger

Explanation / Answer

1) b) false

2) Apply, 1/f = 1/u + 1/v

1/f = 1/16.03 + 1/26.57

f = 10 cm

3) Real, Smaller

4) magnfification, m = -(image height/object height)

m = -v/u

u = -v/m

= -(13.11)/(-3.66)

= 3.58 cm

5) m = -v/u

= -22.34/10.54

= 2.12

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