Posted by **Jon** on Tuesday, April 8, 2008 at 3:46am.

1)An object of height 4 cm is placed at a distance of 20 cm from a convex lens of focal length 10 cm. Find the nature of the image.

1/f=1/d1+1/do

d1=fdo/do-f

(10)(20)/20-10

d1=20

m=-(20)(4)/20

-4 or 4 away

answer: real, inverted

2)Light passes from air into water at 45.0 d/C to the normal. If the index of refraction of water is 1.33, find the angle of refraction.

sin-1((1.00/1.33)sin45.0

32.1 d/C

- Physics -
**drwls**, Tuesday, April 8, 2008 at 6:31am
The numbers are correct, but I am not familiar with your "d/C" notation. I hope it has nothing to do with degrees C, which is a unit of temperature, not angle. Angle-measuring units are just called "degrees".

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