Assessment Problems 5

NASAPhysics

Online Course

Optics

Assessment Problems

1. Parallel light rays strike the left side of a concave lens and pass through. Why don’t the light rays come to a focus on the right side of the lens?

Answer: When the light rays pass through a concave lens, the rays diverge rather than converge at a point on the right side of the lens.
2. A light ray strikes a plane (smooth) mirror at an angle of 0⁰. What is the value of the reflected angle?

Answer: The reflected angle is back along the direction of the incident ray or the angle of reflection is also 0⁰.
3. Knowing that parallel light rays change direction after passing through a convex lens and converge at the focal point, make a ray drawing showing the formation of the image of a candle located to the left of the focal point on the candle’s side of the lens.