Deadline 3uUnerts : 100% until Tuesday, April 10 at 8:00 AM Cumulative Problem 1

Question

Deadline 3uUnerts : 100% until Tuesday, April 10 at 8:00 AM Cumulative Problem 13 2 A compound microscope has a tube length of 21.0 cm (D in class notes) and an objective lens of focal length 7.0 cm. 1) If it is to have a magnifying power of 200x, what should be the focal length of the eyepiece? Assume a near point of 25 cm. (Express your answer to two significant figures.) 0.37 m Submit You currently have 1 submissions for this question. Only 10 submission are allowed You can make 9 more submissions for this question. Your submissions: 0.37 Computed value: 0.37 Feedback: Right answer ! Submitted: Friday, April 6 at 2:54 PM 2) If the final image is viewed at infinity, how far from the objective should the object be placed? (Express your answer to two significant figures.) cm Subrnit 10.60 You currently have 9 submissions for this question. Only 10 submission are allowed. You can make 1 more submissions for this question.

Explanation / Answer

Given,

L = 21 cm ; fo = 7 cm ; M = 200 x

1)We know that

M = L D/fo fe

200 = 21 x 25/7 x fe

fe = 0.38

B)i = L - fe

i = 21 - 0.38 = 20.62 cm

We know from lens eqn

1/f = 1/i + 1/o

o = 20.62 x 7/(20.62 - 7) = 10.59 cm

Hence, o = 10.59 cm

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