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What do you call a substance through which things are partially visible?
a.) Opaque object
b.) Transparent object
c.) Lustrous object
d.) Translucent object

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Answer
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Hint: Sunglasses allow some light to pass through them which allows you to see. The objects on the side of the object appear fuzzy and unclear. The rest of the light is either absorbed or reflected off the surface of the glasses.

Complete step by step answer:
Let us understand about translucent objects:
Have you ever noticed through a stained glass window on a sunny day or watched the sun rays penetrate a frosty pane on a cold winter morning? If so, you have witnessed translucency. To say that the material is translucent is to say that light may pass through that material, but images on the other side of the materials are not clearly visible. Translucent materials allow us to focus our attention on the quality of the light that passes through them, rather than being focused on the imagery that is on the other side.

My favorite examples of translucent objects are wax paper or frosted glass. As you’ll agree, light is able to pass through these materials to the extent that the luminous objects behind them are identifiable –unlike solid objects behind which a potential light source on the other side of it would be unnoticeable. However, it’s not possible to make out clearly all the details of those objects.

The substance through which things are partially visible are called translucent objects. Henceforth, option D is your required answer!

Note: To say that a material is transparent is to say that light passes through a material and images on the other side of that material can be clearly as they truly appear. A good example of this would be looking through a clean window; objects on the other side would be clearly and accurately visible