Answer: The Materials of separating salt sand and iron fillings is measurement
Explanation: The explanation to the answer is very easy in basic physics
Slower cooling engenders the growth of larger crystals in igneous rocks, thus, your answer should be slow cooling!
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Answer
Given,
Periscope uses 45-45-90 prisms with total internal reflection adjacent to 45°.
refractive index of water, n_a = 1.33
refractive index of glass, n_g = 1.52
When the light enters the water, water will act as a lens and when we see the object from the periscope the object shown is farther than the usual distance.