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Stress tension per unit cross sectional area.
Strain extension per unit length.
Young modulus Stress/strain ( as long as the limit of proportionality has not been reached).
Limit of proportionality The limit beyond which, when a wire or a spring is stretched, its extension is…
Refractive index Speed of light in free space / speed of light in a substance ( c(vacuum)/c(material), sini/sinr,
Total internal reflection A light ray travelling in a substance is totally internally reflected at a boundary
with a substance of lower refractive index, if the angle of incidence…