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What is the unit of power of a lens ? ...

What is the unit of power of a lens ?
Define it .

Text Solution

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The unit of power of a lens is the dioptre (D).
one dioptre is the power of a lens whose focal length is one metre .
1 dioptre (D)=`(1)/("1 metre (m)")`
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The unit of power of a lens is

a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends. b) What is the unit of power of a lens? Define the unit of power of a lens. c) A combination of lenses for a camera two converging lenses of focal length 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.

What is the formula for power of a lens ?

What is the power of a lens ?

The unit of focal power of a lens is