What is the wavelength range of visible light?
About 400 nm to 750 nm.
What is a ray of light in optics?
The straight-line path light travels when wavelength is small compared to objects.
What lies in the same plane during reflection at a spherical mirror?
The incident ray, reflected ray, and normal at the point of incidence.
What is the formula relating focal length and radius of curvature for a spherical mirror?
The focal length equals half the radius of curvature , .
Light wavelength range
400 to 750 nm
Ray of light
Straight-line light path
Speed of light
Approximately 3 × 10^8 m/s
Mirror focus
Point where reflected rays converge
Focal length formula
f = R/2 for spherical mirrors
Mirror equation
1/v + 1/u = 1/f
Magnification formula
m = -v/u for spherical mirrors
Test your knowledge with 11 questions on Ray Optics and Optical Instruments.
1. Which description best defines light in terms of its electromagnetic wavelength range?
2. What path does a ray represent when the wavelength of light is small compared with ordinary objects?
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