2. A beam of light passes through a single slit 3.6 x 10-5 m wide and creates a

Question

2. A beam of light passes through a single slit 3.6 x 10-5 m wide and creates a diffraction pattern on a screen 67 cm away from the slit. The first dark fringe is located 1.1 cm from the central bright fringe. What is the wavelength of light being used?

5. A 3.5 cm tall object stands 15 cm in front of a convex lens with focal length f= 12 cm. a) Draw a ray diagram to show where an image is formed. Include a sketch of the image which indicates its approximate height relative to the object and whether it

Explanation / Answer

Number 2)

Apply y/L =m(wavelength)/a

.011/(.67) = 1(wavelength)/(3.6 X 10-5)

wavelength = 591 nm

Number 5)

Apply 1/f = 1/p + 1/q

1/12 = 1/15 + 1/q

q = 60 cm

This image is real so it can be projected on a screen.

For the height...

h'/h = -q/p

h'/3.5 = -60/15

h' = -14 cm (The negative means its inverted)

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