Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

For a prism, when the light undergoes minimum deviation, the relationship between the angle of incidence ( $i$ ) and the angle of emergence ( $i'$ ) is:

$i = i'$

$i > i'$

$i < i'$

$i = 0$

Step-by-Step Solution

Prism Deviation: When a ray of light passes through a prism, the angle of deviation $\delta$ depends on the angle of incidence $i$ .
Condition for Minimum Deviation: As the angle of incidence increases, the angle of deviation first decreases, reaches a minimum value (called the angle of minimum deviation, denoted by $\delta_m$ ), and then increases.
Symmetry at Minimum Deviation: At the specific position of minimum deviation ( $\delta = \delta_m$ ), the light ray passes symmetrically through the prism.
Conclusion: Because of this symmetrical passage, the angle of incidence becomes exactly equal to the angle of emergence ( $i = i'$ or $i = e$ ). Additionally, the angles of refraction at the two faces are equal ( $r_1 = r_2$ ), and the refracted ray inside the prism is parallel to its base.

Practice Mode Available

Master this Topic on Sushrut

Join thousands of students and practice with AI-generated mock tests.

Get Started