Optics Question 410

Question: If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of objective

[AFMC 1994]

Options:

A) 100 cm

B) 10 cm

C) 20 cm

D) 25 cm

Show Answer

Answer:

Correct Answer: A

Solution:

|m| =fofe=20 and L=fo+fe=105

fo=100 cm



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