Question

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QUESTION 3 You take an object that is 5.25 cm high and place it 31.4 cm in front of a converging lens and observe an inverted image after the lens. You measure the inverted image with a ruler, and its length is 13.7 cm. What is the focal length of the lens in millimeters? (State answer as integer and use negative sign if appropriate. Do not confuse cm and mm. Do not include unit in answer.) QUESTION 4 What is the critical angle in degrees for total reflection of light inside a medium with refractive index 2.62 when the surrounding medium has a refractive index 1.67? (State answer with 1 digit right of decimal. Do not include unit)

Answer 1

3) 5.25cm F 31.4 cm 81.939 cm 137 cm use magnification formula, m = -di do hi ho -13.7 - di 31-4 5.25 di 31.4 x 13.7 81.939 cm 5.25 Use lens formula, I di f f ㅗ do + X100 81.939 xlo ㅗ 3.4 4.405 m ma! -Ito = = f = 0.227 mi 227 mm cans.) For TIR , n, sino, Nz Sin 90° => 2.52 sino, = 1.67 X1 o 41.50