SOME ADDITIONAL ANSWERS AND QUESTIONS FROM LIGHT CHAPTER.

SOME ADDITIONAL ANSWERS AND QUESTIONS FROM LIGHT CHAPTER .

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Question 1 . What are the two types of spherical mirror?

Answer: - the two types of spherical mirror are concave and convex mirrors

Question 2. Which type of lens forms always a virtual image?

Answer: - Concave lens forms always a virtual image

Question 3 . State the differences between a convex and a concave lens.

                                         

Question 4. What type of mirror is used as a side view mirror in a scooter?

Answer: - Convex mirror.

Question 5. Write some uses of lenses.

Answer: - Lenses are widely used in spectacles, telescopes and microscopes.

Question 6. What happens when light falls on a polished or a shiny surface?

Answer: When light falls on a polished or a shiny surface light gets reflected.

Question 7. What makes things visible to us?

Answer: Objects are visible only when light reflected from them reaches our eyes.

Question 8.What kind of image is formed by concave lens?

Answer: A concave lens always forms erect, virtual and smaller image than the object.

Question 9. What is the nature of the image formed by a convex mirror?

Answer: Image formed by a convex mirror is erect, virtual and smaller in size than the object.

Question 10. What is reflection of light?

Answer: Bouncing back of a light ray after hitting any surface is known as reflection of light.

Question 11. What is concave mirror?

Answer: If the reflecting surface of a spherical mirror is concave, it is called a concave mirror.

Question 12. What is diverging lens?

Answer: A concave lens diverges (bends outward) the light and is called a diverging lens.

Question 13.Why we are not able to see the candle flame through a bent pipe?

Answer: We are not able to see the candle flame through a bent pipe because light travels along straight lines.

Question 14. Why are concave and convex mirrors called spherical mirrors?

Answer: Concave and convex mirrors are called spherical mirror because their reflecting surfaces are the parts of hollow sphere of glass.

Question 15.Write the uses of convex mirror.

Answer: Uses of convex mirror are:

1.They are used as side mirrors in vehicles.

2. They are used in magnifying glass.

Question 16 .What is a virtual image? Give one situation where a virtual image is formed.

Answer: An image which cannot be obtained on a screen is called a virtual image. The image formed by a plane mirror is virtual image because it could not be obtained on a screen.

Question 17 .How can we change the direction of the light?

Answer: We can change the direction of the light by phenomenon called reflection.

Question 18. What is real image?

Answer: An image which can be obtained on a screen is called a real image.

Question 19. What is convex mirror?

Answer: If the reflecting surface is convex, then it is a convex mirror.

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