Parallel light rays strike the surface of a concave spherical mirror (neglect the effects of spher- ical aberration) in the direction of the main axis of the mirror. The light rays subsequently O A. converge at the focal length. for capacitors. O B. diverge as though emitted from a point located a distance behind the mirror equal to the focal length. O C. are reflected and remain parallel. O D. converge at the center of the sphere.

7. Two identical lenses of focal length f are placed at a distance 2f from each other. An object of height h is placed at a distance 3f to the left of the left lens of the pair. If one views the object through these two lenses from the right, what is the height of the image? (1) 0.67 h (2) h (3) 0.25 h 8. A uniform magnetic field is going into the plane of the page (4) 0.33 h Two charged particles of the (5) 0.5 h 2

how to slove?

irections: Fill in the blanks in the sentence below. Below each paragraph are words corresponding on e properties and behavior of light that you will encounter in this module. Write your answer on a ean sheet of paper. Light is a natural agent that stimulates sight and make things possible. it is a type of energy known as 1. is given out by luminous objects such as the sun, light bulbs and laser. It is made up of littie packets of energy called 2. Light travels as waves. But unlike sound waves, it does not need any material It a to carry its energy along. This means that light can travel through a 3. completely airless space. Light waves travel out from their source in a straight lines called 4. vacuum photons rays electromagnetic radiation

Geometric physics q 41

2. (a) A ray of light in air is incident on an air-to-glass boundary at an angle of exactly 30° with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal?

(b) Explain why a person's legs appear very short when wading in a pool. Justify your explanation with a ray diagram showing the path of rays from the feet to the eye of an observer who is out of the water.