Answer:According to the data results and the period table, these elements/substances are similar because they are in the same group; not only that but they both discharge from metals.
Explanation: I got you
Answer:
the Glancing angle is the angle between the incident ray and plane mirror which is 90o in the given case. The angle between the direction of the incident ray and the reflected ray is the angle of deviation. Since the angle of deviation for a plane mirror is twice the glancing angle, the angle of deviation is 1800.
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