What is the power of convex lens having focal length of 50 cm in diopter?
= 100/50 = 2 dioptre. The SI unit of power is dioptre.
What is the diopter and focal length of convex lens?
The algebraic sign of the magnifying power indicates whether the lens causes an incident pencil of parallel light rays to converge or to diverge. Thus, a diverging lens having a focal length of 1 m has a power of -1 diopter, and a converging lens of focal length 0.5 m has a power of two diopters.
What is the power of lens of focal length 50 cm?
Answer: The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is -2; D stands for diopters, the unit of power for lenses. Hence, the power of a concave lens of focal length 50 cm is -2D.
What is the focal length of a convex lens of Power 4 diopter?
Based on the above formula, the focal length of a lens, given its diopter, is calculated as follows: For example, if a lens has diopter +2, its focal length is 1000/2=500mm, and a lens of +4 diopter has focal length 1000/4 = 250mm.
What is the power of a convex lens of focal length 80 cm?
∴ p = 1 80 × 10 2 = 100 80 = 1.25 D .
What is the power of a convex lens of focal length 5cm?
The magnifying power of the lens. The magnifying power of the convex lens is 6.
What is the maximum and minimum focal length of human eye?
The maximum focal length of eye lens is 2.5 cm. The distance between lens and retina is 2.5cm. Minimum focal length occur when you focus on images at your nearpoint The minimum focal length of eye lens is 2.27 cm.
What is the formula of diopter?
The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters.
What do you mean by 1 diopter?
Answer: 1 dioptre of power of a lens is described as the unit of measurement of the optical power of a lens or curved mirror equivalent to the reciprocal of focal length (f). … The SI unit of power of lens is dioptre whose focal length is one meter, which is denoted by the letter D.
Is the power of a lens is 2D what is its focal length?
Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=50cm. Answer: Since, Power P = -2 D, Focal length f = 100/(-2) = – 50 cm.
What is the power of a lens having a focal length?
The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
What is the focal length of lens whose power is 1.5 D?
= 1/+1.5 = 0.67 m.