Light - Questions and Answers
Class 7 Science Part 2 Chapter 6
Assam State Education Board Syllabus 2025-2026 Covered
This chapter explains the properties of light, reflection, and its various applications. Below are the important questions and answers from NCERT & SCERT Assam Class 7 Science Chapter 6 - Light, based on the Assam State Education Board syllabus for 2025-2026.
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Join Our WhatsAppIntroduction to Light
- Light is a form of energy that enables us to see objects.
- It travels in a straight line and exhibits properties like reflection and refraction.
- Light helps us form images in mirrors and lenses.
Class 7 Science Question Answer – Part 2
Below are the chapters of Class 7 Science Part 2. Click on the chapter name to access the respective question-and-answer content:
- Fibre to Fabric
- Respiration in Organisms
- Transportation in Animals and Plants
- Reproduction in Plants
- Electric Current and its Effects
- Light
- Water: A Precious Resource
- Forests: Our Lifeline
- Wastewater Story
1. Fill in the Blanks
(a) An image that cannot be obtained on a screen is called a ____________.
(b) The image formed by a convex __________ is always virtual and smaller in size.
(c) The image formed by a __________ mirror is always of the same size as that of the object.
(d) An image that can be obtained on a screen is called a __________ image.
(e) The image formed by a concave __________ cannot be obtained on a screen.
Solutions:
(a) virtual image
(b) mirror
(c) plane mirror
(d) real
(e) lens
(a) We can obtained an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always forms a virtual image. (T/F)
(c) We can obtained a real, enlarged, and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always forms a real image. (T/F)
Solutions:
(a) False
(b) True
(c) True
(d) False
(e) False
3. Match the Following
Answer:
| Column I | Column II |
|---|---|
| (a) A plane mirror | (v) The image is erect and of the same size as the object. |
| (b) A convex mirror | (ii) Can form images of objects spread over a large area. |
| (c) A convex lens | (i) Used as a magnifying glass. |
| (d) A concave mirror | (iii) Used by dentists to see an enlarged image of teeth. |
| (e) A concave lens | (vi) The image is erect and smaller in size than the object. |
4. State the characteristics of the image formed by a plane mirror.
Ans:-
(i)The image distance and object distance are equal.
(ii) The size of the image is equal to the size of the objects.
(iii) The image is erect and virtual.
(iv) The image is laterally inverted.
5. Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
Ans:- The letters that appear the same when viewed in a plane mirror are: A, H, I, M, O, T, U, V, W, X, and Y because they exhibit lateral symmetry.
6. What is a virtual image? Give one situation where a virtual image is formed.
Ans:- A virtual image is an image that cannot be projected onto a screen. One example is the image formed by a plane mirror.
7. State two differences between a convex and a concave lens.
Ans:-
| Convex Lens | Concave Lens |
|---|---|
| Thick in the middle, thin at the edges. | Thin in the middle, thick at the edges. |
| Can form a real or virtual image. | Always forms a virtual image. |
8. Give one use each of a concave and a convex mirror.
Ans:- Concave mirrors are used in the headlights of vehicles.
Convex mirrors are used as side-view mirrors in vehicles.
9. Which type of mirror can form a real image?
Ans:- A concave mirror can form a real image.
10. Which type of lens always forms a virtual image?
Ans:- A concave lens always forms a virtual image.
Choose the correct option in questions 11–13.
(i) A virtual image larger than the object can be produced by:
(a) Concave lens
(b) Concave mirror
(c) Convex mirror
(d) Plane mirror
Answer: (b) Concave mirror
(ii) David observes his image in a plane mirror. The distance between the mirror and his image is 4m. If he moves 1m towards the mirror, the new distance between David and his image is:
(a) 3m
(b) 5m
(c) 6m
(d) 8m
Solution:-
Initially:
Distance of David from mirror = 2 m.
Distance of image behind the mirror = 2 m.
Total distance = 4 m.
After moving 1 m closer:
Distance of David from mirror = 1 m.
Distance of image behind mirror = 1 m.
New distance: 1 m (David to mirror) + 1 m (mirror to image) = 2 m.
Total distance = 1 m (David to mirror) + 1 m (mirror to image) + 4 m (initial total distance) = 6 m.
Answer: (c) 6m
(iii) A driver reversing a car at 2 m/s sees a truck in the rearview plane mirror. The speed at which the truck’s image appears to approach him is:
(a) 1 m/s
(b) 2 m/s
(c) 4 m/s
(d) 8 m/s
f the driver moves backward at 2 m/s, his image in the mirror also appears to move backward at 2 m/s.
Now, relative to the driver, the image of the truck appears to approach at double this speed, because:
Answer: (c) 4 m/s
Class 7 Science Chapter 6 - Important Questions & Answers
Q1: What is light?
Answer: Light is a form of energy that enables us to see objects. It travels in a straight line and can be reflected or refracted.
Q2: What is reflection of light?
Answer: Reflection is the bouncing back of light when it strikes a smooth surface, like a mirror.
Q3: What are the two types of reflection?
Answer: The two types of reflection are:
- Regular reflection: Light reflects from a smooth surface, forming a clear image.
- Diffuse reflection: Light reflects from a rough surface, forming no clear image.
Q4: What is the difference between a concave and a convex mirror?
| Concave Mirror | Convex Mirror |
|---|---|
| Curved inward like a spoon. | Curved outward like the back of a spoon. |
| Forms real and inverted images. | Forms virtual and upright images. |
| Used in torches and headlights. | Used in rearview mirrors. |
Q5: What is refraction of light?
Answer: Refraction is the bending of light as it passes from one medium to another, such as from air to water.
Q6: Why does a pencil appear bent in water?
Answer: The bending of light due to refraction causes the pencil to appear bent when placed in water.
Q7: What is a lens?
Answer: A lens is a transparent object that refracts light. It can be:
- Convex lens (thicker in the middle, converges light).
- Concave lens (thinner in the middle, diverges light).
Q8: What is the function of the human eye?
Answer: The human eye helps us see by focusing light onto the retina, which sends signals to the brain.
Q9: What is the role of the iris and pupil in the eye?
Answer: The iris controls the amount of light entering the eye, and the pupil is the opening through which light enters.
Q10: Why do we see a rainbow?
Answer: A rainbow forms due to the dispersion of light, where sunlight is refracted, reflected, and dispersed by water droplets.
Q11: What is a periscope and how does it work?
Answer: A periscope is an optical instrument used in submarines. It uses mirrors to reflect light and help see objects above the water.
Q12: What is a kaleidoscope?
Answer: A kaleidoscope is an instrument that forms beautiful patterns using multiple reflections from mirrors.
Q13: What is the difference between luminous and non-luminous objects?
| Luminous Objects | Non-Luminous Objects |
|---|---|
| Emit their own light. | Do not emit their own light. |
| Example: Sun, candle. | Example: Moon, book. |
Q14: How does a convex lens help in correcting vision?
Answer: A convex lens is used in spectacles to correct farsightedness (hypermetropia) by converging light onto the retina.
Q15: What are some uses of light?
Answer: Light is used in:
- Vision and photography.
- Optical instruments like microscopes.
- Communication (fiber optics).
FAQs on Light
Q1: Why does a mirror form an image?
Answer: A mirror forms an image due to the reflection of light.
Q2: Why does a plane mirror form a virtual image?
Answer: A plane mirror forms a virtual image because the reflected rays appear to come from behind the mirror.
Q3: What are some practical applications of reflection?
Answer: Reflection is used in mirrors, telescopes, and headlights.
Q4: What is the speed of light?
Answer: The speed of light in a vacuum is approximately 3 × 10⁸ m/s.
Q5: What are natural sources of light?
Answer: The Sun, stars, and fireflies are natural sources of light.
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