Who first stated the principle of refraction that postulates that every substance has a specific bending ratio – 'refractive index'?
Willebrord Snellius
Willebrord Snellius is credited with formulating the law of refraction and the concept of the refractive index in 1621.
What is the reason for formation of Mirage in desert?
Optical fiber works on which of the following principle of light?
Which one of the following processes is responsible for the glittering of air bubbles rising through water?
What was the chief objective of the 'Wahabi movement'?
What causes the mottling of the dental enamel?
In an optical fibre the signal is transmitted:
Rajat has hypermetropia. What type of lens will the ophthalmologist recommend to correct his vision?
The impression of an image persists on the retina for about _________ of a second.
Convex and concave mirrors are examples of?
The incident ray, the _________ at the point of incidence and the reflected ray all lie in the same plane.
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
Which one of the following colours is least deviated by the glass prism?
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
What is the reason for formation of Mirage in desert?