Lisa Ann is nearsighted with a near point of 75. cm. (a) What ...

[dakota nelson]

Lisa Ann is nearsighted with a near point of 75. cm.
 
  (a) What FOCAL LENGTH is this?
  (b) What POWER lens is needed to correct her nearsightedness (assuming distance from lens to eye is negligible)?

Question 2

Light in a transparent material (index of refraction 1.333 ) strikes the boundary with another transparent material (n = 1.010).
 
  (a) What is the critical angle for total internal reflection?
  (b) By what percent does the wavelength change going from the 1st to the 2nd material?

[jasonq]

Answer to Question 1

(a) -75. cm
(b) -1.33 Diopters

Answer to Question 2

(a) 49.26
(b) 32.0

[dakota nelson]

Thank you!

[jasonq]

Always glad to help...