The figure (Figure 1) shows a small plant near a thin lens. The ray shown is one

Question

The figure (Figure 1) shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 1.00cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram to answer the following questions.

a) Using only the ray shown, decide what type of lens this is.

b)What is the focal length of the lens?

c)Calculate where the image should be.

The figure (Figure 1) shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 1.00cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram to answer the following questions. a) Using only the ray shown, decide what type of lens this is. b)What is the focal length of the lens? c)Calculate where the image should be.

Explanation / Answer

a)

it is converging lens

b)

here each square box has length of 1.00cm

from the figure focal length f=9 cm

c)

from the figure object distance u=5cm

now,

1/u +1/v=1/f

1/5 +1/v =1/9

====>

image distance v=-11.25 cm (image is virtual)

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