The angle of deviation ( $δ$ ) versus angle of incidence(i) is plotted for a prism.
Pick up the correct statements.
a) Angle of the prism is 60°
b) The refractive index of prism is $\sqrt{3}$
c) For deviation to be 65°, the angle of incidence i=55°
d) The curve of δ-i graph is parabolic

see full answer

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

All correct

a, b correct

b,c correct

a,b,c are correct

answer is C.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

For minimum deviation,

$δ_{m} = 2 i - A$

$\Rightarrow A = 2 i - δ_{m} = 60^{0}$

$μ = \frac{\sin (\frac{A + δ_{m}}{2})}{\sin \frac{A}{2}}$

$\Rightarrow μ = \frac{\sin (\frac{60 ° + 60 °}{2})}{\sin \frac{60 °}{2}} = \sqrt{3}$

$δ = i + e - A$

$\Rightarrow i = δ + A - e = 65^{0} + 60^{0} - 70^{0} = 55^{0}$

The curve of δ-i graph is not parabolic.

Watch 3-min video & get full concept clarity