Go to the PhET website and open Geometric Optics . Select \"principal rays,\" \"

Question

Go to the PhET website and open Geometric Optics. Select "principal rays," "curvature 0.8," "refractive index 1.87," "diameter 0.3," and "virtual image."

(a) Check "ruler" and use it to measure the focal distance.
____________ cm

(b) Select an object distance larger than the focal length and measure it. Measure the image distance. (Be sure to select a distance at least 2 cm larger than the focal length and no longer than the ruler.)

(c) Calculate the magnification. Do not neglect to use the correct algebraic sign.
_____________

(d) Move the object until the magnitude of the magnification is one while the image remains inverted. What are the object and image distances?

(f) Use the thin-lens formula to find the answers to part (d).

Explanation / Answer

a) f = R/2=0.8/2=0.4cm

b) distance of object =Do=3.4cm

1/ image distance=1/Di = -1/0.4 - 1/ 3.4

Di =- 0.0.35cm

c) Magnification = M = Di/Do = -0.35/3.4 = -0.10

let Do=P and Di=q

d) 1/f = q+p / qp

q=p

1/f = 2p/p2

1/f = 2/p

p =2f

p =2(0.4)

p =0.8cm do =0.8cm   

q =0.8cm di=0.8cm

f) same to d

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