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LoginLight travels from air into glass slab of thickness 50 cm and refractive index 1.5.
(i) What is the speed of light in glass?
(ii) What is the time taken by the light to travel through the glass slab?
(iii) What is the optical path of the glass slab?
Class 12 Physics in Class 12 3 years ago
refractive index, `n = (c )/(v)`
SPEED of light in glass is, `v = (c )/(n) = (3 xx 10^(8))/(1.5) = 2 xx 10^(8) MS^(-1)`
Time taken by light to travel through slab is, `t = (d)/(v) = (0.5)/(2 xx 10^(8)) = 2.5 xx 10^(-7) s`
optical path, d. = nd = `1.5 xx 0.5 = 0.75 m = 75 cm`
LIght woul have travelled 25 cm more (75 cm - 50 cm)in vacuum by the same time had there been a glass slab.
Posted on 11 Dec 2021, this text provides information on Class 12 related to Physics in Class 12. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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