A. 4J
B. 15J
C. 5J
D. 100J

Correct Answer: Option D

D. 100J

Explanation

W = FS = 20 X 5

= 100J

SEE ALSO  A ray of light travelling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30°. Calculate the angle of refraction. [Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]

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