Focusing Lens
Learning1. Check the lenses
2. I make a telescope using convex and concave lenses
3. Looking for hints with a telescope
4. Use a convex lens to break the cord
| comfort | ⦾ Comfortable |
| age rating | 0+ Everyone |
| website | training.contentsda.kr |
| developer | ContentsDaInc |
| publisher | ContentsDa Inc |
| connection | Internet not required |
| app version | 1.0 |
| languages | English |