# 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.

a. 0.336 mrad

b. 0.672 mrad

c. 0.168 mrad

d. 2.32 mrad

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

Answer: c. 28.6 cm

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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