Question

4.Velocity of light in air is 3×108 m/s . While it’s velocity in a medium is 1.5×108 m/s. Then, refractive index of this medium is
(a)3
(b)5
(c)0.5
(d)2

5. Prism is a homogenous transparent medium consisting of
(a)2 rectangular and 3 triangular
(b)3 rectangular and 3 triangular
(c)3 rectangular and 2 triangular
(d)4 rectangular and 1 triangular

Answer 1

FINAL ANSWER

4.(d)2

5.(c)3 rectangular and 2 triangular

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Answer 2

Answer:

question 4--answer: option d

question 4--answer: option c

Explanation:

Q)4) refractive index= speed of light in air/speed of light in another medium

=> 3x10^8/1.5x10^8= 2

Q)5) a prism has 2 rectangular shaped refractive surfaces and one rectangular shaped base. Thus, a prism has 3 rectangular surfaces and the remaining two are triangular surfaces.

hope this helps you!