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Solutions ⇒ Class 7th ⇒ Science ⇒ 15. Light

Solutions 15. Light - Additional Questions | Class 7 Science - Toppers Study

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Solutions 15. Light - Additional Questions | Class 7 Science - Toppers Study

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Chapter 15 Science class 7

Additional Questions class 7 Science Chapter 15. Light

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15. Light

| Additional Questions |

Solutions 15. Light - Additional Questions | Class 7 Science - Toppers Study


Additional Questions:


Ques: What is concave mirror?
Ans: If the reflecting surface of a spherical mirror is concave, it is called a concave mirror.

Ques: What is convex mirror?
Ans: If the reflecting surface is convex, then it is a convex mirror.

Ques: What is real image?
Ans: An image formed on a screen is called a real image.

Ques: What is virtual image?
Ans: The image formed by a plane mirror could not be obtained on a screen. Such an image is called a virtual image.

Ques: Which type of mirror can form a real image?
Ans: Concave mirror. 

Ques: Which type of lens forms always a virtual image?
Ans: Concave lens.

Ques: Give one use each of a concave and a convex mirror.
Ans: 

Use of Concave Mirror- 

(i) In Head-lights of Vehicles

Use of Comcave Mirror-

(i) It is used in vehicles as side mirror.

Ques: What is convex lens?
Ans: Those lenses which feel thicker in the middle than at the edges are convex lenses.
Ques: What is concave lens?
Ans: Those which feel thinner in the middle than at the edges are concave lenses.

Ques: Why is convex lens called converging lens?
Ans: A convex lens converges (bends inward) the light generally falling on it. Therefore, it is called a converging lens. 
Ques: Why is concave lens called diverging lens?
Ans: A concave lens diverges (bends outward) the light and is called a diverging lens. 

Ques: Which lens is used as magnificent lens? 

Ans: convex lens. 

Ques: What is white light?
Ans: The sunlight consists of seven colours. The sunlight is said to be white light.
Ques: Name all colours presence in rainbow in their real order.
                          Or 
Ques: Name all colours consist in white light. 

Ans: red, orange, yellow, green, blue, indigo and violet.
Ques: How many colours are there in white light. 
Ans: seven.

Ques: Fill in the blanks:

(i) An image that cannot be obtained on a screen is called _________.

(ii) Image formed by a convex __________ is always virtual and smaller in size.

(iii) An image formed by a __________ mirror is always of the same size as that of the object.

(iv) An image which can be obtained on a screen is called a _________ image.

(v) An image formed by a concave ___________ cannot be obtained on a screen.

Answer: 

(i) Vertual image

(ii)  miror

(iii) plane

(iv) real 

(v) lens

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Solutions ⇒ Class 7th ⇒ Science
1. Nutrition in Plants
2. Nutrition in Animals
3. Fibre to Fabric
4. Heat
5. Acids, Bases and Salts
6. Physical and Chemical Changes
7. Weather, Climate and Adaptations of Animals to Climate
8. Winds, Storms and Cyclones
9. Soil
10. Respiration in Organisms
11. Transportation in Animals and Plants
12. Reproduction in Plants
13. Motion and Time
14. Electric Current and its Effects
15. Light
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18. Wastewater Story

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