A. Differentiate the following/ Give the difference between: 1. Mirror and lens (on how image is formed) 2. Convex & concave mirror (a. in terms of physical characteristics, b. as to what happens to light rays when it hit its surface) 3. Double convex & double concave lens (same instruction in no. 2, in terms of a. and b.) 4. Real images and virtual image 5. Farsightedness & nearsightedness (a. as to what appears clearer to the person, b. as to where the image is formed relative to the retina, c. as to the necessary corrective lens) B. State the following: 1. Laws of Reflection 2. Laws of Refraction C. Give direct and brief answers to the following questions. Cite the reference/s used. 1. Why is the sky blue during fair day and why is it red during sunset? 2. Explain the following about a rainbow: - Why is it usually seen after the rain? Why are the colors arranged the way they are seen? Why is it shaped like a bow? 3. Define the following: a. refractive index b. critical angle c. total internal reflection 4. Use the defined terms in no. 3 to explain the sparkle or brilliance of diamond.