Question

Which of the following is true for minimum deviation of a prism?? a)i1 >i2. b) r1 >r2> c) A=2r1 d) i1 =i2​

Answer 1

(d) i1=i2 is true for minimum deviation of a prism.

Explanation:

since, we know that-

Minimum deviation of prism is defined as the position at which angle of deviation in prism is minimum.

In minimum deviation , the refracted ray in the prism is parallel to its base.

In other words, the light ray is symmetrical about the axis of symmetry of the prism.

Therefore,

Prism lies symmetrically w.r.t.  the incident ray (i) and emergent ray (e)means that the angle of incidence (i1) and the angle of emergence (i2) are equal.

Hence, option (d) i1 = i2 is correct.

Answer 2

Answer:

(d)

Explanation:

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