Question
Question: A prism having an apex angle 4<sup>0</sup> and refractive index 1.5 is located in front of a vertica...
A prism having an apex angle 40 and refractive index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror?
A
1760
B
40
C
1780
D
20
Answer
1780
Explanation
Solution
d = (m – 1) A = (1.5 – 1) 4 = 20
Deviation by mirror = 180 – ∠i = 1760
\ Total deviation = 2 + 176
= 1780