Two power of 4
- Two to the power of 40
- Two to the power of 48
- Two to the power of 42
- Two to the power of 46
- Two to the power of 41
- Two to the power of 45
- Two lens of power 4d and
- Two to the power of 47
- Two to the power of 43
- Two to the power of 49
- Two lenses of power 4d and
- Two thirds to the power of 4
- Two thin lenses of power 4d and 2d