Trippie Redd is 19 years old
Question
<em>Which of the following is used to bring an object into focus? A.diaphragm B.revolving nose piece C.course adjustment D.objective lens</em>
Answer:
<em>Knob used to bring object into approximate focus; used only with low-power objective. Knob used to bring object into final focus. Lens system below the stage used to focus the beam of light on the object being viewed. The flat surface of the microscope that rests on the table.</em>
<em>D.) Objective lens</em>
Hope this helps!
Answer: The nuclear arms race was one of the most alarming features of the Cold War superpower competition between the United States and Soviet Union. Both sides rapidly expanded their nuclear stockpiles, but after two decades, each embarked on efforts to cut down its arsenal.
Explanation: The United States' use of nuclear weapons to end World War II led to a determined and soon successful effort by the Soviet Union to acquire such weapons, followed by a long-running nuclear arms race between the two superpowers. The Soviet Union conducted its first nuclear test in 1949
Invisible ink: During the Revolutionary War invisible ink usually consisted of a mixture of ferrous sulfate and water.
secret codes: Ciphers and secret codes were used to ensure that the contents of a letter could not be understood if correspondence was captured.
Mask letters: Search Results
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A "Mask Letter" is the name given to a method that the British used during the Revolutionary War to conceal a secret message. This method allowed the secret message to be hidden in plain sight. ... To discover the hidden message, the reader would place a "mask" on top of the letter to reveal the secret message
