Question

When the ray of light is incident from denser medium having refractive index 2. what should be
the angle of incidence for the ray to go out ?
(1) Less than 30 (2) Less than 45 (3) Less than 60° (4) Less than 90°​

Answer 1

Answer:

less than 30. hope it helps

Answer 2

(2) Less than 45° is the ideal answer.

Explanation:

• The angle of incidence should be much less than the vital angle then most effective the mild is going to the alternative medium i.e, from denser to rarer.
• we've got n1sin(i)=n2sin(r)in which n1 is the refractive index of a denser medium.
• i is the angle of incidence withinside the denser medium is the angle of refraction withinside the rarer medium if it's far air the value of
• n(air)=1.sin(i) = (n2/n1)× sin(r)
• ⇒ i=sin⁻¹[(n2/n1)×sin(r)].
• sinФ critical ≤ 1/√2
• ⇒Ф critical ≤ 45°.

The angle of incidence for the ray to exit is much less than 45°.

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