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Test: Total Internal Reflection (NCERT)

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Test: Total Internal Reflection (NCERT) - Question 1

For a total internal reflection, which of the following is correct?

Detailed Solution for Test: Total Internal Reflection (NCERT) - Question 1

In total internal reflection, light travel from denser to rarer medium.

Test: Total Internal Reflection (NCERT) - Question 2

Light travels in two media A and B with speeds 1.8 x 108 m s-1 and 2.4 x 108 m s-1 respectively. Then the critical angle between them is

Detailed Solution for Test: Total Internal Reflection (NCERT) - Question 2

Here, vA = 1.8 × 108m s−1,vB = 2.4×108 ms−1
Light travel slower in denser medium. Hence medium A is a denser medium and medium B is a rarer meedium. Here, light travels from medium A to medium B. Let C be the critical angle between them

Test: Total Internal Reflection (NCERT) - Question 3

Critical angle of glass is θ1 and that of water is θ2. The critical angle for water and glass surface would be (μg = 3/2, μw = 4/3).

Detailed Solution for Test: Total Internal Reflection (NCERT) - Question 3

As wμg = 9/8 < aμw < aμg
∴ θ > θ2 >  θ1

Test: Total Internal Reflection (NCERT) - Question 4

Critical angle for light going from medium (i) to (ii) is θ. The speed of light in medium (i) is v, then the speed of light in medium (ii) is

Detailed Solution for Test: Total Internal Reflection (NCERT) - Question 4

where v and v′ are the speeds of light in medium (i) and medium (ii) respectively.

Test: Total Internal Reflection (NCERT) - Question 5

A ray of light travelling in a transparent medium of refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45. For which of the following value of μ. the ray can undergo total internal reflection?

Detailed Solution for Test: Total Internal Reflection (NCERT) - Question 5

For total internal reflection,
sin i > sin C
where
i = angle of incidence
C = critical angle

Hence, option (c) is correct.

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