51. A monochromatic ray of light is incident on an equilateral glass prism at an angle of incidence equal to 45° and suffers minimum deviation by an angle of 30°. (a) What is the angle of emergence? (b) If the angle of incidence is changed to (i) 25° and (ii) 50%, will the angle of deviation will be more or less than 30°?
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51. A monochromatic ray of light is incident on an equilateral glass prism at an angle of incidence equal to 45° and suffers minimum deviation by an angle of 30°. (a) What is the angle of emergence? (b) If the angle of incidence is changed to (i) 25° and (ii) 50%, will the angle of deviation will be more or less than 30°?
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Explanation:
(i) As the ray is suffereing minimum deviation in an equilateral glass prism so,
i
1
=i
2
∴i
2
=48
0
(ii) If the angle of incidence is changed
(a) 30
0
, the angle of deviation will be more than 36
0
.
(b) 60
0
, the angle of deviation will be more than 36
0
.
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