Question

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Answer 1

Answer:

c) /3/2

Explanation:

pie/2 = 180/2 = 90

see the attachment

Answer 2

Answer:

 μ= √3/√2 = μ=3/2−−−√

Explanation:

=)We know that for TIR ANGLE OF INCIDENCE SHALL BE  more than critical angle, ie, Θ>c

=)See diagram, ∠r + ∠ Θ =90°

=)sini/sinr  =μ  

=)ie sin 45/ sin r= μ

=)sinr= 1/ μ√2

=)Θ> c,  ie, sinΘ> sin c

=)sin90-r > 1/μ

=)cosr >1/μ

√1-sin^2(r)  >1/μ

=)1- 1/2μ^2  > 1/μ^2

=)1 > 1/2μ^2  + 1/μ^2

=)μ^2  > 3/2

=)μ= √3/√2 = μ=3/2−−−√

Diagram:

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