How can slove my physics homework? hlep please!

Posted on 2015-01-22 06:36:00 in Physics by JOHN

1. a ray of light passes from water into air with an angle of of refraction of 30 degrees. what is the angle of incidence? a. 19 b. 22 c. 49 d. 42

2. A certain substance has a critical angle of 20 degrees. if light travels through air into this substance at an incident angle of 30 degrees, at which angle will it enter the substance? a. 43 degrees b. 20 degrees c. 10 degrees. d. 15 degrees

3. what type of image do you get using a convex lens when you place an object at the centre of curvature? a. real b. virtual c. no image

4. what type of image do you get using a concave lens when you place an object at the focal point? a. real b. virtual c. no image

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