2. Questions Bank
  3. 10th Class
  4. Science
  5. Light - Reflection and Refraction

10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    In a direct vision spectroscope, there are three identical crown glass prisms and two identical flints glass prism. If mean reflective indices of crown glass and flint glass be respectively 1.56 and 1.63 and angle of each crown glass prism be 6, then angle of each flint glass prism should be

    A) \[7{}^\circ \]

    B)        \[8{}^\circ \]  

    C) \[9{}^\circ \]

    D)        \[10{}^\circ \]

    Correct Answer: B

    Solution :

                    \[(n+1){{\delta }_{c}}=(n){{\delta }_{f}}\] \[\therefore \]  \[3\times 0\cdot 56\times {{A}_{c}}=2\times 0\cdot 63\times {{A}_{f}}\] \[\Rightarrow \]               \[{{A}_{f}}={{8}^{o}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner