Which mirror has the larger focal length?

Exercise and reference answers

Questions

1. A

   R = 40 cm (f = 20 cm)

   B

   R = 24 cm (f = 12 cm)

   Higher value

   R = 40 cm (f = 20 cm)

2. A

   R = 30 cm (f = 15 cm)

   B

   R = 50 cm (f = 25 cm)

   Higher value

   R = 50 cm (f = 25 cm)

3. A

   R = 18 cm (f = 9 cm)

   B

   R = 16 cm (f = 8 cm)

   Higher value

   R = 18 cm (f = 9 cm)