Light

 Light

1. List the three phenomena responsible for rainbow formation in the sky.

2. Why do we see stars twinkling while planets do not twinkle?

3. An object is placed 15 cm from a convex lens of focal length 10 cm. What is the nature and position of the image formed?

4. What is meant by power of accommodation of the eye? How does the focal length of the eye lens change when we shift looking from a distant object to a nearby object?

5. A person cannot see farther than 10 m clearly. What defect is he suffering from? How can it be corrected? Explain with diagrams

6. A ray of light is incident on a glass slab perpendicularly. What is the incident angle and refracted  angle?

7. Which of the mirrors can be used to obtain a magnified and virtual image of the object? Draw  a ray diagram for the same