Bài 1 : Một vật cao 1,7m khi đặt cách máy ảnh 2m, phim cách vật kính 1,5cm. Tính:

a. Dựng ảnh ? ( không cần đúng tỉ lệ )

b. Ảnh của vật trên phim cao bao nhiêu cm ?

Bài 2: Một người đứng cách một cột điện 20cm. Cột điện cao 7m. Nếu coi khoảng cách từ thể thủy tinh đến màng lưới của mắt người ấy là 1,8cm thì ảnh của cột điện trên màng lưới sẽ cao bao nhiêu cm ?

Combine each pair of sentences into one by using a sutable RELATIVE CLAUSES :

1. She is the woman. I told you about her.

2. You didn't tell us the reason. We have to cut down our daily expenses for that reason.

3. I recently went back to Paris. I was born there nearly 50 years ago.

4. Do you know the music ? Is it being played on the radio.

5. I saw a lot of people and horses. They went to the market.

6. I've seen the little girl and her puppy. They have lived next door for ages.

7. This is Mrs. Jones. Her son won the champoinship last year.

8. Is this the style of hair ? Your wife wants to have it.

9. The professor is excellent. I am taking his course.

10. The building is the tallest one in town. He works in that building.

11. Mr.Brown is a nice teacher. We studied with him last year.

12.The day was rainy. She left on that day.

13. Her father died last year. She looked after him for over twenty years.

14. Is that the computer ? Your father bought it last month.

15. This is the place. We visited this place last week.