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Answers to numerical questions

Exercise 5.4 Exercise 6.2

1. (a) (i) -30 cm (virtual, erect, and 1. (b) 30 cm
enlarged), (ii) at infinity, (iii) 90 2. 3.3 cm, 5 cm
cm, real, inverted, and enlarged.
Exercise 6.3
2. -10 cm
FOR ONLINE READING ONLY
1. 73.1 cm, 4.9 cm
3. m = 2, 18 cm, real, inverted, and 2. 30.2
enlarged
3. 35, 144 cm
4. 60 cm 5. (a) 700 (b) 12.82 cm

5. 2 cm
6. 75 cm Exercise 6.4

7. 4 1. (a) 6.7 cm (b) 1.7 cm
2. 2.4 m
Revision Exercise 5 3. 10.4 cm

2. 3.27 cm
3. 35.3 Exercise 6.5
1. (a) 2.1 cm (b) 2.06 cm
4. 1.34
(c) 1.94 cm
6. (a) 41.8 2. 33.33 cm, 3 D

(b) 48.8 (c) 62.5 3. 2 D
8. 100 cm, 20 cm 4. (b) (i) 34.62 cm

9. (b) -30 cm (ii) 2.89 D
10. 20.83 cm (iii) 3.6

12. 4 cm Revision Exercise 6
77.1�
13. 62.5 2. (b) (ii) 22.2cm
3. (a) 43.48 D
Chapter Six (b) 47.39 D
(c) 3.91 D

Exercise 6.1 5. 15.5 cm, 30
1. (a) 6 (b) 25 cm 6. (a) 2.6 cm (b) 30

2. 20 cm, 5 10. (a) 3.75 cm (b) 11.12
3. 3.6 cm 11. (a) -48 cm (b) 2.08 D
4. (a) 4.2 cm, 5 cm 12. (a) 4.9 cm real
(b) 6, 5 (b) 0.0196, 3.53 cm

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