Minimum deviation angle of a thin prism of refractive index ′μ′ and angle of prism A is -
(A) (1- μ)A
(B) (μ – 1)A
(C) (μ + 1)A
(D) (μ + 1)A2
1 Answers
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Assertion : Angle of deviation depends on the angle of prism. Reason : For thin prism, `del = (mu - 1) - A`.
Correct Answer - A For a thini prism, the relation between angle of deviation, `del`, angle of prism A and refractive index `mu` is `del = (mu - 1)A`
2 Answers 2 views
Prism angle of a prism is `10^(@)` ,Their refractive index for red & violet color is `1.51 & 1.52` respectively .Then dispersive power will be `(1) 0.
Dispersive power of prism `delta = ((mu_(v) - mu_(r))/(mu_(y) - 1)) "but" mu_(y)= (mu_(v)+ mu_(r))/(2) = (1.664-1.644)/(1.654-1)= 0.0305`
2 Answers 1 views
In an isosceles prism of prism angle `45^(@)`, it is found that when the angle of incidence is same as the prism angle, the emergent ray grazes the em
Correct Answer - D `i=(pi)/(2),e=(pi)/(4),A=(pi)/(4)` `(sini)/(sin r_(1))=(sine)/(sinr_(2))=mu` `rArr sinr_(1)=(1)/(mu) and sinr_(2)=(1)/(sqrt2mu)` Since `r_(1)+r_(2)=A=(pi)/(4) rArr r_(1)=(pi)/(4)-r_(2)` `rArr sinr_(1) =(1)/(sqrt2)cosr_(2)- (1)/(sqrt2)sinr_(2)` `=sqrt2 sinr_(1)+sinr_(2)=cosr_(2)` `=(sqrt2)/(mu)+(1)/(sqrt2mu)=sqrt(1-(1)/(2mu^(2)))= (1)/(mu^(2))(2+(1)/(2)+2)=1-(1)/(2mu^(2))` `= (1)/(mu^(2))((9)/(2)+(1)/(2))=1` `mu^(2)=5rArr mu=sqrt5 `.
2 Answers 1 views
A prism (apex angle `A le 90°)` produces minimum deviation that is equal to the apex angle. What can be said about the refractive index of the materia
Correct Answer - `sqrt(2) lt mu lt 2`
2 Answers 1 views
A crown glass prism of refracting angle `8^(@)` is combined with a flint glass prism to obtain deviation without dispersion. If the refractive indicat
Correct Answer - `1.53^(@)`
2 Answers 1 views
Light passes symmetrically through a `60^(@)` prism of refractive index 1.54. After emergence out from the prism the light ray is incident on a plane
Correct Answer - `0^(@)`
2 Answers 1 views
The refractive index of the material of a prism of `60^(@)` angle for yellow light is `sqrt(2)`. Calculate angle of minimum deviation, angle of incide
Correct Answer - `30^(@), 45^(@), 30^(@)`
2 Answers 1 views
A ray of light is incident on the glass prism at an angle of `40^(@)`. Find the angle of emergence, if the angle of prism is `60^(@)` and refractive i
Correct Answer - `58.5^(@)`
2 Answers 1 views
A ray of light suffers a deviation of `3.2^(@)` on passing through a thin prism of angle `5^(@)`. What is the refractive index of the material of the
Correct Answer - 1.64
2 Answers 1 views
A thin glass prism placed in air produces minimum deviation of `4^(@)` in a light ray. If the prism is immersed in water, what will be the minimum dev
Correct Answer - `1^(@)`
2 Answers 1 views