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A person with a near-point distance of 25 cm finds that a
Chapter 27, Problem 56P(choose chapter or problem)
Problem 56P
A person with a near-point distance of 25 cm finds that a magnifying glass gives an angular magnification that is 1.5 times larger when the image of the magnifier is at the near point than when the image is at infinity. What is the focal length of the magnifying glass?
Questions & Answers
QUESTION:
Problem 56P
A person with a near-point distance of 25 cm finds that a magnifying glass gives an angular magnification that is 1.5 times larger when the image of the magnifier is at the near point than when the image is at infinity. What is the focal length of the magnifying glass?
ANSWER:
Step 1 of 2
Here we need to calculate the angle above the horizon does the person on the shore of lake see the sun. The sun appears at an angle from the vertical. Let the incident angle of sun rays on lake surface is . The angle above the horizon does the person on the shore of lake see the sun is . Let the refractive index of the water be and air is .