Go back to the original settings. Consider that the fringe spacing is of the order of cm separations and the distance to the screen is several meters (4.33 m). Thus, the angle is small (\theta \sim 10^{-2}/4.33 = 2 \times 10^{-3}~ radiansθ∼10 −2 /4.33=2×10 −3 radians) and we can apply the small angle approximation. From the values you can obtain from the interference pattern, calculate the wavelength of the red laser?

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -