15. A ray of light in water n=1.33 enters a sheet of glass n=1.52 at a 30 degree

Question

15. A ray of light in water n=1.33 enters a sheet of glass n=1.52 at a 30 degree angle of incidence, find the angle of refraction.

16. A converging lens forms an image of an object 25 cm to the right of the lens when an object is placed 18 cm to the left of the lens. What is the focal length of the lens? Is this image real or virtual? Upright or inverted? Smaller or larger than the original object.

17. Draw a ray trace diagram showing the image location for a 5 cm tall object placed 8 cm away from a converging lens that has a focal length of 10 cm. Is this image real or virtual? Upright or inverted? Smaller or larger than the original object?

Explanation / Answer

15)

from snell's law

n1*sin(theta)1 = n2*sin(theta)2

here, n1 = 1.33, n2 = 1.52, (theta)1 = 30 degree

sin(theta)2 = (n1/n2)*sin(theta)1

sin(theta)2 = (1.33/1.52)*sin(30)

sin(theta)2 = 0.4375

(theta)2 = sin^-1(0.4375)

(theta)2 = 25.94 degree

Angle of reflection is 25.94 degree

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