Question

1. A) A farsighted person wears a spectacle whose power is 2.50 D to see an object clearly that is 25.0 cm away? What is the near point of this person. Assume the spectacle (corrective) lens is held 1.50 cm away from the eye by eyeglass frames. Answer: m

   

          B) Two lens with f = 10.0cm are 20.0cm apart. An object is placed 30.0cm from the left lens. How far from the right lens will an image be formed?

Answer: cm

What is the magnification?

Answer:  

         C) A laser passes through a diffraction grating with 1000 lines per mm. On a screen 5.00cm from the diffraction grating, the spacing between the 0th order and 1st order diffracted beam is 3.20cm. What is the wavelength of the laser in nm?

Answer: nm

        D)What is the smallest thickness of a soap bubble that produces constructive interference for red light with a wavelength of 650 nm? The index of refraction of

soap is 1.33.

Answer: nm

Answer 1

12