one word/term. 1.3.The minimum amount of energy required to start a reaction. 1.4.The distance between the centre of a lens and its focal point. 1.5. The type of image formed on a screen when light rays converge.
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1.3. The minimum amount of energy required to start a reaction is called the activation energy. To find this term, you can search for "definition of activation energy." You can also refer to chemistry textbooks or reliable online sources.
1.4. The distance between the center of a lens and its focal point is called the focal length. To learn about this term, you can search for "definition of focal length." You can also consult physics textbooks or reputable websites.
1.5. The type of image formed on a screen when light rays converge is called a real image. To find out more about this term, you can search for "definition of real image." Physics textbooks or trusted online sources can provide you with detailed explanations.