Question

Solve and fill in the blanks.

Velocity in first medium (v1)		Velocity in second medium (v2)		Refractive index 1η2		Refractive index 2η1
3 × 108 m/s		1.2 × 108 m/s		…		…
…		2.25 × 108 m/s		4/3		…
2 × 108 m/s		…		…		1.5

Answer 1

Velocity in first medium (v1)		Velocity in second medium (v2)		Refractive index 1η2		Refractive index 2η1
3×108 m/s		1.2×108 m/s		2.5		0.4
2.99×108 m/s		2.25×108 m/s		4/3		0.75
2×108 m/s		3×108 m/s		2/3		1.5

(i) ₁η₂ =

₂η₁ =

(ii) v₁=₁η₂×v₂ =

v₁ = 2.99×10⁸ m/s

₂η₁ =

(iii) v₂=₂η₁×v₁ =

v₂ = 3×10⁸ m/s

₁η₂ =