Need a help 1-5 Without corrective lenses, a near-sighted person can see clearly

Question

Need a help 1-5

Without corrective lenses, a near-sighted person can see clearly only objects that are within 100 cm from his eyes. The person has normal vision when wearing contact lenses. What type of lens are the contact lenses, and what is their focal length? a. diverging, -100 cm b. converging, 100 cm c. diverging, -50 cm d. converging, 50 cm e. diverging, -200 cm In a Young's double-slit experiment, the distance from the central maximum on the screen to the first minimum is 2.0 mm. The slits are separated by d = 200A, where A is the wavelength of the incident light. What is the distance from slits to screen? a. 0.200 m b. 0.800 m c. 0.267 m d. 0.400 m e. 8.00 m In order to increase the separation between bright fringes on the screen of a Young's double slit apparatus, what must you do? a. decrease the distance from slits to screen b. decrease the slit separation c. increase the slit separation c. decrease the wavelength Monochromatic light is incident on a soap film (n = 1.4) from air (n = 1.0). What is the appearance of the film in reflected light as the thickness of the film approaches zero? a. bright (a maximum) b. dark (a minimum) c. intermediate intensity (not near a maximum or a minimum)

Explanation / Answer

1 b

2 b

3 c

4 a

5 c

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