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Two campers wish to start a fire during the day. One camper is nearsighted, and one is farsighted. Whose glass should be used to focus the Sun's rays onto some paper to start the fire?

a) either camper

b) nearsighted camper 

c) the farsighted camper

 

 

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Sagar Yadav
Sagar YadavLv10
31 Oct 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Background information
A person with normal vision can focus on objects as close as a fewcentimeters from the eye up to objects infinitely far away. Thereexist, however, certain conditions under which the range of visionis not so extended. For example, a nearsighted person cannot focuson objects farther than a certain point (the far point), while afarsighted person cannot focus on objects closer than a certainpoint (the near point). Note that even though the presence of anear point is common to everyone, a farsighted person has a nearpoint that is much farther from the eye than the near point of aperson with normal vision.

Both nearsightedness and farsightedness can be corrected with theuse of glasses or contact lenses. In this case, the eye convergesthe light coming from the image formed by the corrective lensrather than from the object itself.

Part A
When glasses (or contact lenses) are used to correctnearsightedness, where should the corrective lens form an image ofan object located at infinity in order for the eye to form a clearimage of that object?

The lens should form the image at the far point.


Correct
PArt B If a nearsighted person has a far point df thatis 3.50 m from the eye, what is the focal length f1 thecontact lenses that the person would need to see an object atinfinity clearly?

f1 = ? m

You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood. Which would be the best choice for the type of mirror?

a) flat

b) concave

c) convex

 

You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood. Which would be the best choice for the type of mirror?

a) flat

b) concave

c) convex

 

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