Question

Which of the following statements is/are correct about the refraction of light from a plane surface
when light ray is incident in denser medium? [is critical angle]


(A) The maximum angle of deviation during refraction is -- it will be at angle of incidence !
2

(B) The maximum angle of deviation for all angle of incidences is 1-20, when angle of incidence
is slightly greater than o.

(C) If angle of incidence is less than a then deviation increase if angle of incidence is also
increased.

(D) If angle of incidence is greater than C then angle of deviation decreases if angle of incidence is
increased.​

Answer 1

When angle of incidence is equal to the critical angle, deviation=

2

π

−C

When angle of incidence is greater than C, total deviation is π−2i (decreases as i increases),which is greatest for i=C, thus maximum deviation=π−2C

When angle of incidence is less than C, deviation is r−i=sin

−1

(μsini)−i, which increases as i increases