The power of a lens of focal length 10 cm is
Concept:
Power of a Lens:
- The reciprocal of the focal length is known as the power of a lens.
- It represents the bending power of a lens for a light ray.
- P is the power of the lens and f is the focal length of the lens.
The unit of power of a lens is Diopter (D) when the focal length of the lens is taken in meters (m).
Calculation:
Given that f = 10 cm = 0.1 m
P = 1 / f = 1 / 0.1 = 10 D
The correct answer is option (3)
Similar Questions
- In a simple astronomical telescope, the objective and the eyepiece used respectively, are:
A myopic person has a power of -1.25 Dioptre. What is the focal length and nature of his lens?
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
The twinkling of a star is due to:
A non-spherical shining spoon can generally be considered as a
Which of the following combinations of source and screen would produce the sharpest shadow of an opaque object?
Which one of the following is the correct sequence of passage of light in a compound microscope?
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is
Important Questions from Optics
Which among the following is used as a reflector in search lights?
The incident ray, the ray perpendicular to the point of incidence, and the reflected ray all lie________.
Which is the only event to prove that light is a transverse wave?
A. Scattering of light
B. Interference
C. Diffraction
D. Polarisation
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
Which mirror is preferred as a rear-view (wing) mirror in vehicles because of its wider field of view?
