6 Answered Questions for the topic Focal Length


Depth of Field in Photography

A 50mm focal length lens sees the world the same as a person with 20/20 vision in terms of depth of field and linear perspective.
Focal Length Physics Lens


Need Help With This Physics 3 Questions?

a. An object is placed 4.0 m away from a thin converging lens of focal length +1.0 m. The image formed by the lens is... more
Focal Length Optics Concave Refraction


Concave Mirror Problems

The famous Chinese magician Foo Ling Yu performs a classic magic trick using a concave mirror with a focal length of 1.6 m. Foo uses the mirror to produce an image of a light bulb that is the same... more
Focal Length Length Lens Telescope


finding focal length.

Please be aware that you need to use centimeters instead of meters for the answer in this question. This is different than the practice test. If you build a telescope with a focal length of 6.33... more
Focal Length Physics Refraction


focal length of converging glass lens in water

A converging glass lens (n = 1.52) has a focal length of 40 cm in air. Find its focal length when it is immersed in water, which has an index of refraction: nw = 1.33.


Find the Relation Between the Focal Length and the Object Distance

There is a specific case where for a single converging lens the object distance equals the image distance. Find the relation between the focal length and the obect distance in this case.   

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