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# Multiple Choice Questions-Light

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1. A myopic person wears eyeglasses with a lens strength of - 3.5 diopters. Where is the far point for that person's eyes?

a. 3.5 m
b. 25 cm
c. 28.6 cm
d. infinity

2. Red light of wavelength 632.8 nm is incident on a pair of slits whose separation is 0.75mm. What is the separation of neighboring interference maxima on a screen 360cm from the slits?

a. 1.5 cm
b. 3.0 mm
c. 1.5 mm
d. 1.2 mm

3. What is the minimum angle of resolution of an eye with a pupil diameter of 1.0 mm? Please take the wavelength of light to be 550 nm.

4. An astronaut journeying to the nearby star Lacaille 9352 at a speed of 0.945c relative to earth requires 20.0 years measured on earth to complete his trip. How many years does he age during his journey?

a. 20 y
b. 15 y
c. 10.5 y
d. 6.54 y

5. Suppose that all matter in a 125.0 microgram grain of sand was entirely converted to energy. How much energy would be released?

a. 1.125 x 10^13 J
b. 3.750 x 10^4 J
c. 1.125 x 10^9 J
d. 2.520 x 10^10 J

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Answers to Multiple Choice Questions in Light.

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1. A myopic person wears eyeglasses with a lens strength of - 3.5 diopters. Where is the far point for that person's eyes?

a. 3.5 m
b. 25 cm
c. 28.6 cm
d. infinity

lens power (in diopters) = 1 / focal length (in meters)

lens power (in diopters) = -3.5
therefore focal length= -0.286 m= -28.6 cm

2. Red light of wavelength 632.8 nm is incident on a pair of slits whose separation is 0.75mm. What is the separation of neighboring interference maxima on a screen 360cm ...

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