The efficiency of a device such as a lamp can be calculated using this equation: efficiency = (useful energy transferred ÷ energy supplied) × 100 using the formula, calculate the efficiency of the lamp shown in the diagram above.

Post a picture of the diagram and I can help!

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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