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A fish inside a rectangular tank is looking at its food sitting 4 inches away from the tank. How far away from the tank does the food appear to be to the fish? (ignore the glass walls of the tank)
5.3 inches
4.0 inches
3.0 inches
2.7 inches
Alex looks into a shiny spherical ball. If he holds up his finger 2.5 cm away from the ball (10 cm diameter), what is the magnification of his finger in the image?
2
0.8
0.67
0.5
0.25
Helen has a glasses prescription of 1.5 diopters, where is her near point without the glasses?
a. 67 cm
b. 40 cm
c. 25 cm
d. 18 cm
1) We have to use the apparent distance formula due to refraction.
Apparent distance = Real distance/n
where n = refractive index = 1.33 for water
Thus,
Apparent distance = 4/1.33
= 3.0 inches
Please post the other questions separately. Thanks and good luck:)
SHOW ALL WORK: A fish inside a rectangular tank is looking at its food sitting 4...
SHOW ALL WORK: A fish inside a rectangular tank is looking at its food sitting 4 inches away from the tank. How far away from the tank does the food appear to be to the fish? (ignore the glass walls of the tank) 5.3 inches 4.0 inches 3.0 inches 2.7 inches Alex looks into a shiny spherical ball. If he holds up his finger 2.5 cm away from the ball (10 cm diameter), what is the magnification of his finger...