Question

Answer this Question:- The refractive index of the glass prism shown in the figure (Attachment)is 2 for green light . A ray of cyan colour light incident at P on the face of BC of the prism. From which side would the light emerge? (Given critical angle for blue colour is greater than 15 degree.)​

Answer 1

Given :

➳ Refractive index of glass prism for green light = 2

To Find :

➝ We have to find the side from which light would emerge..

Concept :

Critical angle and Total internal reflection (TIR) :

➠ Critical angle is the angle made in denser medium for which the angle of reflection in rarer medium is 90°.

➠ When angle in denser medium is more then critical angle the light ray reflects back in denser medium following the laws of reflection and the interface behaves like a perfectly reflecting mirror.

(Refer the first attachment for better understanding about TIR)

➠ Ray of cyan colour is the mixture of blue and green colour.

➠ Question is about ray of green light so, we won't consider ray of blue light. :D

Calculation :

ATQ, Refractive angle of prism for green light is 2.

We have to find critical angle for green light.

Let's calculate ☃

$\dashrightarrow\tt\:\sin\:C=\dfrac{1}{n}$

$\dashrightarrow\tt\:\sin\:C=\dfrac{1}{2}$

$\dashrightarrow\tt\:C=\sin^{-1}\dfrac{1}{2}$

$\dashrightarrow\underline{\boxed{\tt{\purple{C=30\degree}}}}$

፨ Now, Refer the second attachment. It shows ray path of green light.

Now, Refer the second attachment. It shows ray path of green light.So, Ray of green light will move in the direction of AB after TIR at surface AC.

Answer 2

Answer:

Hi anuj yella unnaru

Naa peeru Karthik

class 10th CBSE lo chadutunnanu

meeru ??

Explanation: