With respect to air, the critical angle in a medium for red light of wave length ₁ is . Other facts remaining same, critical angle for yellow light of wave length ₂ will be

Step-by-step solution

Critical angle = ⁻¹ ( 1 n )= ⁻¹ ( v c ) Critical angle = ⁻¹ ( f c ) ( v = c n ) for red light, = ⁻¹ ( f ₁ c )( v=f ) for yellow light ^ = ⁻¹ ( f ₂ c ) Since ₁> ₂ then ^ <