exercise 4b q. 6

Asked by nilesh.dhote74 | 3rd Jun, 2020, 09:03: PM

Expert Answer:

Question : a) How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.

b) Using the curve in part (a) above, how do you infer that for given prism, the angle of minimum deviation δmin is unique for the given light.

Solution: - 

a) As the angle of incidence increases, the angle of deviation decreases first and reaches to a minimum value (δm) for a certain angle of incidence. By further increasing the angle of incidence, the angle of deviation is found to increase.

Variation of angle of deviation (δ) with angle of incidence(i):


Selina Solutions Icse Class 10 Physics Chapter - Refraction Of Light At Plane Surfaces 


b) For a given prism and given colour of light, angle of minimum deviation is unique since only one horizontal line can be drawn parallel to the i-axis at the lowest point of i curve.

 

Answered by Shiwani Sawant | 3rd Jun, 2020, 09:15: PM