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  • (a) Draw a labelled ray diagram to show the path of a ray of light incident obliquely on one face of a glass slab. (b) Calculate the refractive index of the material of a glass slab. Given that the speed of light through the glass slab is <im

(a) Draw a labelled ray diagram to show the path of a ray of light incident obliquely on one face of a glass slab.

(b) Calculate the refractive index of the material of a glass slab. Given that the speed of light through the glass slab is 2\times 10^{8}\; m/s and in air is 3\times 10^{8}\; m/s.

(c) Calculate the focal length of a lens, if its power is -2.5\; D

 

 

 

 
 
 
 
 

Answers (1)

(a) Labelled ray diagram to show the path of a ray of light incident obliquely on one face of a glass slab is - 

(b) ) nga = Speed of light in air / Speed of light in glass = 3×108 / 2×108 = 3 /2 = 1.5

(c) f (m) = 1/ P (D)

f = 1/ P = 1/ −2.5D = −10/ 25D = −0.4m

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