Question

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)

1. 5.3 inches
2. 4.0 inches
3. 3.0 inches
4. 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?

1. 2
2. 0.8
3. 0.67
4. 0.5
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

Answer 1

use the given formula in which n relative is the refractive index of medium of incidence / refractive index of medium of refraction.

As light goes from outside (air medium) to inside the water.