Fill in the blank spaces with appropriate answers:
The focal length of a divergent lens is 40 cm. The power of the lens is ___ Diopter.

The focal length of a spherical lens is 50 cm. The power of the lens in Dioptre is

Fill in the blanks spaces with appropriate answers. Unlike currents……….

Fill in the blank spaces with appropriate answers: The focal length of a convex lens is 'f'. The object is at a distance x from the focus. If the image formed is real, then the magnification is _____.

Fill in the blanks spaces with appropriate answers. ………..currents attract.

Fill in the blank spaces with appropriate answer: The pole strength of a magnet is a ______ quantity.

Fill in the blank spaces with appropriate answers: The angular dispersive psi = ________

Fill in the blank spaces with appropriate answers: The S.I unit of permittivity is ______.

Fill in the blanks space with appropriate answers : The molecules of dielectrics are.........