Shows a small plant near a thin lens. The ray shown is one of the principal rays

Question

Shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 1.0 cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram to answer the following questions. What is the focal length of the lens? Express your answer in centimeters to one decimal place. The question will be shown after you complete previous question(s). This question will be shown after you complete previous(s). Calculate where the image should be. Express your answer in centimeters to one decimal place.

Explanation / Answer

(B)
A ray Prallel to the principal axis allways passes through the Focal Point of the lens.The distance from the mirror to the focal point is known as the focal length.

From the Digram it is clearly evident, f = 3.5 cm

Focal length of the lens, f = 3.5 cm

(E)
Distance of object from the lens, do = 5.5 cm
We know,
1/f = 1/di + 1/do
1/3.5 = 1/5.5 + 1/di
di = 9.63 cm
Distance of image from the lens, di = 9.63 cm

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