Intext Questions
Page 173:
- Why do we see a rainbow after a rainstorm?
- How can you distinguish between regular and diffuse reflection?
Page 177:
3. What is the difference between a real and a virtual image?
4. Why does a plane mirror form a virtual image?
Page 179:
5. A person stands in front of a plane mirror. How far should the mirror be for the image to appear upright and of the same size as the person?
Page 181:
6. Why is a concave mirror used in headlights of a car?
7. What is the difference between the image formed by a concave mirror and a convex mirror?
Page 182:
8. Why does a pencil placed in a beaker of water appear bent at the water surface?
Exercise Questions
Page 185-186:
What is the difference between reflection and refraction?
Why do we see a rainbow after the rain? Explain.
Define refraction of light. What is the cause of refraction of light?
State the laws of refraction.
What is the angle of incidence? How is it related to the angle of reflection?
What is a real image? Can it be formed on a screen?
What is the focal length of a concave mirror? How does it affect the size of the image formed?
Why do you think light bends when it passes from one medium to another?
Draw a diagram to show the formation of an image by a convex lens.
Explain how a concave mirror forms a magnified image.
Page 173:
- Why does the image in a concave mirror change size when the object is moved closer or farther away?
Page 177:
2. What happens to the image formed by a concave mirror when the object is beyond the focal point?
Page 182:
3. Why is a convex lens used in magnifying glasses, microscopes, and eyeglasses?
Exercise Questions
Page 186-187:
What are the characteristics of an image formed by a concave mirror when the object is placed at different positions (beyond C, at C, between C and F, at F, and between F and the mirror)?
What is the focal length of a concave lens? How does it differ from the focal length of a convex lens?
A light ray travels from air into water. What happens to its speed and direction?
Explain why the image in a convex mirror is always virtual, erect, and diminished in size.
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