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.67 metre or 67 cms

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Q: Power of lens is plus 1.5 d find focal length?
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How do you find the power of a lens?

The power of a lens is 1/focal length (measured in meters).


How do you find power of a power?

The power of a lens is 1/focal length (measured in meters).


Which lens has a greater power convex lens of focal length 10 cm or a convex lens of focal length 20cm?

Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm


Which lens provides more magnification-a low power or a high power?

A lens of short focal length has a greater power (than a lens of large focal length)


What will be the power of convex lens having a focal length is 50 cm?

Convert the focal length to meters, then take the reciprocal. That is how the "power" of a lens is calculated.


How can we find focus of a lens?

Focus or focal length?


If a telescope has an objective lens of 3 inches what is the focal length?

The size (diameter) of a lens does not determine its focal length. The amount of curvature of the lens does. Citing a diameter for a lens doesn't help us find the focal length. Lenses are ground to specifications that allow short or long focal length. The more curved the lens, the shorter the focal length. You can see this if we specify a given curvature and then start to "flatten" the lens. The focal length will get longer and longer as the lens is flattened. When the lens is flat (has to curvature) the lense has an infinite focal length, just like a piece of flat glass.


A concave lens is kept in contact with convex lens of focal length 20cm the combination works as a converging lens of focal length 100cmcalculate the power of concave lens?

i think it is -0.06m i.e. 6cm


How do you find the new focal length when the lence is put in to the water?

to find the new focal length when the lens is put into water it becomes the 4 times the focal length in air.


Whats the focal length of a lens?

The focal length of a lens is the distance from the principal foci to the center of the lens.


What is the power of a convex lens with 10cm focal length?

1.0 diopters


Explain how the focal length changes as a convex lens becomes flatter?

The focal length of a lens is the distance from the center of the lens to the point at which it focuses light rays. The bigger the focal length, the more powerful the lens. ChaCha!