Please Explain Your Answers Completely. Thank You. 9.When John wears glasses wit

Question

Please Explain Your Answers Completely. Thank You.

9.When John wears glasses with a power of +2.5 D which are 1.0 cm away from his eyes, he

can clearly see objects as close as 23 cm from his eyes. What is John

When John wears glasses with a power of +2.5 D which are 1.0 cm away from his eyes, he can clearly see objects as close as 23 cm from his eyes. What is John's near point when he does not wear his glasses? Considering the circuit below, what is the current through the 20 ? resistor? Monochromatic light is incident on a diffraction grating; the second off center maximum is 90 cm away from the pattern's center on a screen which is 1.2 m away from the grating. How far from the center is the third off center maximum?

Explanation / Answer

12)18 ohm is the equivalent resistance

so

total i=9/18=.5

current through 20=.5*20/(20+20)=.25 A

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