In the figure, the image is viewed on a screen and is 13.5 mm tall. What is the

Question

In the figure, the image is viewed on a screen and is 13.5 mm tall. What is the focal length of the lens? +14.6 -14.6 + 20.4 cm -89.3 cm Light from a 600 nm source goes through two slits 0.080 mm apart. What is the angular separation of the two first order maxima occurring on a screen 2.0 m from the slits? 0.15 degree 0.86 degree 0.015 degree 0.0075 degree 1.75 degree In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe? It stays the same. It becomes narrower. It becomes wider. Its behavior depends on the wavelength of the light.

Explanation / Answer

#23:

magnification m = -v/u

m = -13.5/9.7

m = S'/S = V/u = -1.4

v = 1.4 u

so

1/f = 1/u + 1/v

1/f = 1/u - 1/1.4 u

1/f = 1/(0.35) + (1/(0.35* 1.4))

f = +20. 4 cm

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use d sin theta = mL

sin theta = (2-1)* 600 e -9/(0.08 e -3)

sin theta = 0.0075 deg

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25. as Y = mLR/d

where L is wavelength

R is distance from slit t o the screen

d is slit widht

so here if d is reduced, Y will increase

so answer is option C, becomes narrower

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