In the following questions, assume that the distance from the lens to the retina

Question

In the following questions, assume that the distance from the lens to the retina is 2 cm.) 1. The index of refraction of the vitreous humor is greater than the index of refraction of the aqueous humor which is greater than the index of refraction of air. What is the relationship of the speed of light in each of these media? A. Fastest in air, slower in aqueous humor, slowest in vitreous humor B. Fastest in vitreous humor, slower in aqueous humor, slowest in air C. Equal in all three D. Depends on the index of refraction of the lenses which separate the media 2. In order for a normal eye to focus on an object 20 cm away, what Is the required focal length of the eye's lens? A 0.05 cm B. 1.8 cm C. 2.0 cm D. 2.2 cm 3. Two converging lenses are in contact. If the focal lengths are each 5 cm, what is the equivalent focal length of the combination? A. 0.1 cm 2.5 cm C. 5.0 cm D. 10.0 cm

Explanation / Answer

1. as n = c/v

refractive index is inversly proportioanl to spped

so spped is more in less refractive index and vice versa

so

for part 1 :   option 1 is correct

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apply 1/f = 1/u + 1/v

so here u = 2 cm

v = 20 cm

so f = uv/u+v = 2*20/22

f = 1.8 cm, o[ption B it is

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part 3:

apply fnet = f1f2/f1+f2)

fnet = 5*5/(5+5)

fnet = 2.5 cm

option B it is

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