Q1.
Classify the following objects as transparent, translucent or opaque in Table 6.4. (Glass tumbler, Butter paper, Eraser, Frosted glass, Wooden board, Window glass)
Answer
Hold each object over the writing in your notebook and see how much of it you can read.
| Table 6.4: Classification of objects | ||
|---|---|---|
| Transparent | Translucent | Opaque |
| Glass tumbler | Butter paper | Eraser |
| Window glass | Frosted glass | Wooden board |
| also: clean water, cellophane paper, air | also: oiled paper, thin plastic sheet, muslin cloth | also: cardboard, steel plate, brick wall, your palm |
Why frosted glass behaves differently from window glass: both are glass. But the surface of frosted glass has been roughened, so the light that enters is scattered in all directions instead of going straight through. You still get light — which is why a bathroom with a frosted window is bright — but you get no clear picture.
Try This: Rub one side of a piece of clear plastic with sandpaper. The transparent sheet turns translucent in front of your eyes. You have made frosted glass.