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This lecture is from applied physics course with key-points: Optics Problems, Light, Absorption, Refraction, Diffraction, Dispersion, Optical Systems, Law of Reflection, Specular Reflection, Angle of Refraction, Depth Perception, Apparent Depth, Index of Refraction, Snell's Law of Refraction, Total Internal Reflection, Dispersion by Prism, Power of Lens
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i) Light is a form of energy which helps us to see objects. ii) When light falls on objects, it reflects the light and when the reflected light reaches our eyes then we see the objects. iii) Light travels in straight line. iv) The common phenomena of light are formation of shadows, formation of images by mirrors and lenses, bending of light by a medium, twinkling of stars, formation of rainbow etc.
Some Definitions
30 o^30 o
Two plane mirrors form a right angle. How many images of the ball can you see in the mirrors?
A. 1
B. 2
C. 3
D. 4
When a ray of light crosses from one material to another, the amount it bends depends on the difference in index of refraction between the two materials.
Water
Refraction is the Air bending of light as it passes from one medium into another.
refraction
N
θw
θA
Note: the angle of incidence θA in air and the angle of refraction θA in water are each measured with the normal N.
The incident and refracted rays lie in the same plane and are reversible.