Telescope (refracting/reflecting) makes distant objects appear nearer, magnified. Microscope for tiny near objects. Periscope uses mirrors to see over obstacles. Endoscope medical.
Explanation:
Fuse is a safety device: thin wire melts when current exceeds safe limit due to short circuit or overload, breaking circuit. Prevents fire and appliance damage. Based on heating effect. MCB is modern alternative.
Explanation:
Niels Bohr proposed the Bohr model of the atom in 1913. He improved upon Rutherford's model by introducing quantum theory, suggesting that electrons travel in discrete, quantized orbits around the nucleus without radiating energy, and that energy is only emitted or absorbed when an electron jumps between these specific orbits.
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