7 Answered Questions for the topic Lenses

Lenses Physics Optics

05/13/20

A woman has been prescribed lenses that have a +3.2-diopter refractive power. The glasses are worn 2.0 cm from her eyes.

A woman has been prescribed lenses that have a +3.2-diopter refractive power. The glasses are worn 2.0 cm from her eyes. With the lenses, she can read a magazine held 25 cm from her eyes. Which one... more
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05/13/20

The right lens of Josh's contact lenses is a converging lens of +2.50 diopters. He can read a book held as close as 25 cm from his eyes.

The right lens of Josh's contact lenses is a converging lens of +2.50 diopters. He can read a book held as close as 25 cm from his eyes. Complete the following statement: Without his lenses, Josh's... more
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04/12/19

How to get the Cinematic look?
With most movies, you can tell at a glance, if it is (or supposed to be) a blockbuster or not, by how the image looks.Even some American TV-series look better (in my oppinion) than most european... more
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12/03/15

why did they send the Hubble to orbit?
The Hubble Space Telescope is a reflecting telescope in orbit about the earth so that its resolution would not be limited by turbulence in the atmosphere. Its objective diameter is 2.4 m. For... more
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Lenses Physics

03/09/15

object location, angular magnification & final image
A double-convex lens of 6.25 cm focal length is used as a simple microscope. If it is held close to the eye to form an image 25 cm from the eye, where should the object be located? What is the... more
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03/09/15

focal length & power of lens
A farsighted eye cannot form a sharp image of an object which is closer than 40 cm. Find the focal length & power of a lens which will permit the eye to form a sharp image of an object 25 cm... more
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08/14/14

Thin Lens Equation
I was hoping someone could give me an example with answer and reasoning using the Thin Lens Equation.   The one we used in our lab was 1/f = 1/s + 1/s'.   I was hoping all terms could be... more
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