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
Converging/diverging power = 1/focal length = 1/0.20 = 5 per meter = 5 diopters
1.0 diopters
Convert the focal length to meters, then take the reciprocal. That is how the "power" of a lens is calculated.
because manifying power has inerse relation with that of focal length
Power is ZERO Since power = 1/ focal length As focal length of plane mirror is infinity, its reciprocal is 0
Yes converging lens. The power of the lens is given by reciprocal of its focal length. Moreover the power for converging action is +ve. So as we place two converging lenses ie convex lenses, then we have to add the powers. Once again the power becomes +ve. So converging action is definite.
1.0 diopters
Convert the focal length to meters, then take the reciprocal. That is how the "power" of a lens is calculated.
because manifying power has inerse relation with that of focal length
Power (F)= 1/focal length (f) focal length f, is measured in meters the power, F, is in dioptres (D) In converging or convex lenses the power is positive In diverging or concave lenses, the power is negative :)
A lens of short focal length has a greater power (than a lens of large focal length)
It is not necessary that a thinner convex lens have less optical power or a thicker lens has more optical power
i think it is -0.06m i.e. 6cm
A positive lens is also called a magnifying lens. It has convex surfaces and it has a measureable focal length where it produces an inverted image of a distant object. The power in dioptres is the reciprocal of the focal length in metres.
The tendency to converge the rays decides the power factor. So shorter the focal length converging is tremendous. Hence power is reciprocal of focal length
The magnifying power of a telescope is the focal length of the scope in millimeters, divided by the focal length of the eyepiece in millimeters. Focal length of scope: 225cm=2250mm Focal length of eyepiece: 7.5mm 2250/7.5= 300X
Power is ZERO Since power = 1/ focal length As focal length of plane mirror is infinity, its reciprocal is 0
it is zero . Power = 1/focal length The focal length of a plane glass or mirror is infinite, therfore power is zero