18. AB-C, the angle between A and B is 120°
and A = B A - C-. Then what is the
angle between A and B?
a 120
b. 150
c30
d. 60
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Explanation:
These are the two incident rays which are used in the ray construction. One of the rays moves parallel to the principal axis and reflects through the focal point. ... In the animation above, a right-side-up object is located above the principal axis between the focal point (F) and the mirror.
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