Question

If the angle of incidence in denser medium is equal to critical angle, the angle of refraction will be:

• A. $0^o$
• B. ${45}^o$
• C. ${90}^o$
• D. ${135}^o$

Answer 1

Answer: (C)

${90}^o$

as shown in the fig angle of incidence in denser medium increases angle of refraction also increases.

When angle of incidence equals the critical angle, the angle of refraction will be ${90}^o$. and if further increase in the incidence angle light undergoes reflection.