Correct answer
A. 1 meter
Explanation
The power of a lens (P) is defined as the reciprocal of its focal length (f) in meters, measured in diopters (D). So, if the power of the lens is one diopter, then its focal length is 1 meter.
As a result of annihilation of electron and positron, number of γ–ray (Gama ray) photons are: ________?
If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
The value of acceleration due to gravity is minimum on which of these planets?
The dimension of power is_______________?
The ration stress to strain in youngs modulus of the material then tension is__________________?
A body can have constant velocity when it follows a_____________?