A boy observes a piece of stone at the bottom of a river 6.0m deep....

JAMB 2000

A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river, what is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

A. 8.0m
B. 5.5m
C. 5.0m
D. 4.5m

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Correct Answer: Option D

Explanation

Refractive Index = Real Depth/App. Depth
4/3 = 6/app. depth
App Depth = (3 x 6)/4 = 4.5m

There is an explanation video available below.

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Explanation Video

Contributions (7)

clemtommy
10 years ago

jst substitute into d equation. R.index=real deepth/apparent deepth. Cross multiply den 18/4=4.5. Kul!

Like 4 Dislike 1 Reply Quote Follow

kecyfrancis:

cool questin

Like 0 Dislike 1 9 years ago

Olaniyan
2 months ago

sir can u show video on projectile

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Ayomide
2 years ago

solutions to the question please

Like 1 Dislike 1 Reply Quote Follow

Lawy:

Just use, refractive index= real depth/apparent depth and substitute into the equation.

Like 0 Dislike 0 1 month ago

Omah
3 weeks ago

pls sir
where do we now use formula
n=t/t-d

Like 0 Dislike 0 Reply Quote Follow

Shozlee
11 years ago

Cool..............

Like 0 Dislike 1 Reply Quote Follow

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