Answer
Verified
402k+ views
Hint: The refractive index can be found by taking the ratio of the sine of half of the sum of the angle of prism and angle of minimum deviation to the sine of the half of the angle of prism. Using this find the procedure to find the angle of minimum deviation and plot the graph.
Complete step by step answer:
Goal: to calculate the minimum deviation angle for a prism by plotting a graph between the angle of incidence and angle of deviation.
Theory: Refraction happens if a light ray travels from one medium to another which is resulting in the deviation of the emergent ray from that of the incident ray. The refractive index of the material used in the prism can be shown as,
$n=\dfrac{\sin \left( \dfrac{A+{{\delta }_{m}}}{2} \right)}{\sin \left( \dfrac{A}{2} \right)}$
Where${{\delta }_{m}}$be the angle of minimum deviation and $A$ is the angle of the prism.
Procedure: keep the white sheet of paper on a drawing board and place it with the help of drawing pins. $X{X}'$ be the straight line which has been drawn parallel to the length of the paper such that it is in the middle of the paper. Mark the points ${{Q}_{1}},{{Q}_{2}},{{Q}_{3}}...$on the straight line $X{X}'$each at a distance of $5cm$. \[N{{Q}_{1}},N{{Q}_{2}}...\] are the normal that are figured on${{Q}_{1}},{{Q}_{2}},{{Q}_{3}}...$. Create the angles of \[35{}^\circ ,40{}^\circ ....60{}^\circ \] by making straight lines\[{{R}_{1}}{{Q}_{1}},{{R}_{2}}{{Q}_{2}}....\] with respect to this normals. In order to take one edge of the prism for all the observation, consider one corner of the prism as A. fix the prism with its refracting face AB on the line $X{X}'$ and on the point\[{{Q}_{1}}\] and also in the centre of AB. And also mark the boundary of the prism. On the line \[{{R}_{1}}{{Q}_{1}}\], place pins vertically and mark them as \[{{P}_{1}}\] and \[{{P}_{2}}\]. The distance between these pins must not be smaller than \[10mm\]. Look for the images of the points\[{{P}_{1}}\] and \[{{P}_{2}}\], through the prism face, AC. Close our left eye and keep the right eye open, bring the two images in a line. Place the other two pins vertically and name them as\[{{P}_{3}}\text{ and }{{P}_{4}}\]. These pins must be \[10cm\] apart from each other.\[{{P}_{3}}\text{ and }{{P}_{4}}\] must be in one straight with respect to the images of \[{{P}_{1}}\] and \[{{P}_{2}}\]. Mark the pricks of pins\[{{P}_{3}}\text{ and }{{P}_{4}}\]. Repeat the steps 7 to 13 for the rest of the points for angle \[40{}^\circ ,45{}^\circ .....60{}^\circ \].
Observation: the angle of prism $A=60{}^\circ $
The graph can be plotted like this,
Result: the angle of minimum deviation is found. The graph has been plotted.
Note: This graph represents that the angle of incidence increases, the angle of deviation decreases first to attain the minimum value of ${{\delta }_{m}}$and then increases as the angle of incidence increases.
Complete step by step answer:
Goal: to calculate the minimum deviation angle for a prism by plotting a graph between the angle of incidence and angle of deviation.
Theory: Refraction happens if a light ray travels from one medium to another which is resulting in the deviation of the emergent ray from that of the incident ray. The refractive index of the material used in the prism can be shown as,
$n=\dfrac{\sin \left( \dfrac{A+{{\delta }_{m}}}{2} \right)}{\sin \left( \dfrac{A}{2} \right)}$
Where${{\delta }_{m}}$be the angle of minimum deviation and $A$ is the angle of the prism.
Procedure: keep the white sheet of paper on a drawing board and place it with the help of drawing pins. $X{X}'$ be the straight line which has been drawn parallel to the length of the paper such that it is in the middle of the paper. Mark the points ${{Q}_{1}},{{Q}_{2}},{{Q}_{3}}...$on the straight line $X{X}'$each at a distance of $5cm$. \[N{{Q}_{1}},N{{Q}_{2}}...\] are the normal that are figured on${{Q}_{1}},{{Q}_{2}},{{Q}_{3}}...$. Create the angles of \[35{}^\circ ,40{}^\circ ....60{}^\circ \] by making straight lines\[{{R}_{1}}{{Q}_{1}},{{R}_{2}}{{Q}_{2}}....\] with respect to this normals. In order to take one edge of the prism for all the observation, consider one corner of the prism as A. fix the prism with its refracting face AB on the line $X{X}'$ and on the point\[{{Q}_{1}}\] and also in the centre of AB. And also mark the boundary of the prism. On the line \[{{R}_{1}}{{Q}_{1}}\], place pins vertically and mark them as \[{{P}_{1}}\] and \[{{P}_{2}}\]. The distance between these pins must not be smaller than \[10mm\]. Look for the images of the points\[{{P}_{1}}\] and \[{{P}_{2}}\], through the prism face, AC. Close our left eye and keep the right eye open, bring the two images in a line. Place the other two pins vertically and name them as\[{{P}_{3}}\text{ and }{{P}_{4}}\]. These pins must be \[10cm\] apart from each other.\[{{P}_{3}}\text{ and }{{P}_{4}}\] must be in one straight with respect to the images of \[{{P}_{1}}\] and \[{{P}_{2}}\]. Mark the pricks of pins\[{{P}_{3}}\text{ and }{{P}_{4}}\]. Repeat the steps 7 to 13 for the rest of the points for angle \[40{}^\circ ,45{}^\circ .....60{}^\circ \].
Observation: the angle of prism $A=60{}^\circ $
Serial no. | Angle of incidence$\left( {}^\circ \right)$ | Angle of deviation$\left( {}^\circ \right)$ |
1 | $35$ | $10$ |
2 | $40$ | $20$ |
3 | $45$ | $30$ |
4 | $50$ | $40$ |
5 | $55$ | $50$ |
6 | $60$ | $60$ |
The graph can be plotted like this,
Result: the angle of minimum deviation is found. The graph has been plotted.
Note: This graph represents that the angle of incidence increases, the angle of deviation decreases first to attain the minimum value of ${{\delta }_{m}}$and then increases as the angle of incidence increases.
Recently Updated Pages
10 Examples of Evaporation in Daily Life with Explanations
10 Examples of Diffusion in Everyday Life
1 g of dry green algae absorb 47 times 10 3 moles of class 11 chemistry CBSE
What is the meaning of celestial class 10 social science CBSE
What causes groundwater depletion How can it be re class 10 chemistry CBSE
Under which different types can the following changes class 10 physics CBSE
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Which are the Top 10 Largest Countries of the World?
How do you graph the function fx 4x class 9 maths CBSE
Distinguish between the following Ferrous and nonferrous class 9 social science CBSE
The term ISWM refers to A Integrated Solid Waste Machine class 10 social science CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Which is the longest day and shortest night in the class 11 sst CBSE
In a democracy the final decisionmaking power rests class 11 social science CBSE