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Class 8 Exam > Class 8 Notes > Science Curiosity Class 8 - New NCERT > Very Short Answer Questions- Light: Mirrors and Lenses

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT PDF Download

Q1: What makes things visible?

Ans: Light.

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT Light

Q2: Can you see an object in the dark?

Ans: No.

Q3: What is a mirror?

Ans: A smooth and shiny surface is called a mirror.

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT MirrorQ4: What kind of image is formed by a plane mirror?

Ans: Virtual and erect image.

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT Q5: Where is the image formed by a plane mirror?

Ans: Behind the mirror.

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT

Q6: What is the size of the image formed in a plane mirror?

Ans: Same size of the object.

Q7: The distance between the object and its image formed by a plane mirror appears to be 18 cm. What is the distance between mirror and the object?

Ans: 9 cm

Q8: A ray of light is incident on a mirror at an angle of 40°. What is the angle of reflect?

Ans: 40°

Q9: What do we call the image that cannot be obtained on a screen?

Ans: Virtual

Q10. What type of mirror is the inner side of a spoon?
Ans: The inner side of a spoon is a concave mirror.

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT

Q11. What type of mirror is the outer side of a spoon?
Ans: The outer side of a spoon is a convex mirror.

Q12. Define a spherical mirror.
Ans: A spherical mirror is a mirror whose reflecting surface is a part of a hollow sphere.

Q13. In a concave mirror, is the center curved inward or outward?
Ans: In a concave mirror, the center is curved inward.

Q14. In which type of mirror is the reflecting surface curved outward?
Ans: In a convex mirror, the reflecting surface is curved outward.

Q15. What is placed on the glass surface to make a mirror reflective?
Ans: A thin reflective coating like aluminum is placed on the glass surface.

Q16. How does a concave mirror form an image when the object is very close?
Ans: A concave mirror forms an erect and enlarged image when the object is very close.

Q17. How does the image in a convex mirror appear at any distance?
Ans: In a convex mirror, the image is always erect and smaller than the object.

Q18. What type of image does a plane mirror always form?
Ans: A plane mirror always forms an erect image of the same size as the object.

Q19. What is lateral inversion?
Ans: Lateral inversion is the left-right reversal of an image in a mirror.

Very Short Answer Questions- Light: Mirrors and Lenses | Science Curiosity Class 8 - New NCERT

Q20. Which mirror is used as a reflector in torches and headlights?
Ans: A concave mirror is used as a reflector in torches and headlights.

Q21. Why is a convex mirror used as a vehicle’s side-view mirror?
Ans: A convex mirror gives a wider view and forms smaller, erect images.

Q22. What type of mirror is used in modern telescopes?
Ans: Modern telescopes use a large concave mirror.

Q23. What is the First Law of Reflection?
Ans: The First Law of Reflection states that the angle of incidence equals the angle of reflection.

Q24. What is the Second Law of Reflection?
Ans: The Second Law of Reflection states that the incident ray, normal, and reflected ray all lie in the same plane.

Q25. Name the type of mirror that converges parallel light rays.
Ans: A concave mirror converges parallel light rays.

Q26. Why can a concave mirror burn paper in sunlight?
Ans: A concave mirror focuses sunlight to a small point, increasing heat enough to burn paper.

Q27. What is a lens made of?
Ans: A lens is made of transparent material like glass or plastic.

Q28. Which lens is thicker in the middle than at the edges?
Ans: A convex lens is thicker in the middle than at the edges.

Q29. Which lens is thicker at the edges than in the middle?
Ans: A concave lens is thicker at the edges than in the middle.

Q30. How does a convex lens change an image when the object is very close?
Ans: A convex lens forms an erect and enlarged image when the object is very close.

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FAQs on Very Short Answer Questions- Light: Mirrors and Lenses - Science Curiosity Class 8 - New NCERT

1. What are the main types of mirrors and how do they differ?

Ans. The main types of mirrors are plane mirrors, concave mirrors, and convex mirrors. Plane mirrors have a flat surface and produce virtual images that are the same size as the object. Concave mirrors curve inward and can produce real or virtual images, depending on the object's distance from the mirror. Convex mirrors curve outward and always produce virtual images that are smaller than the object.

2. How do lenses work and what are the different types?

Ans. Lenses work by bending light rays that pass through them. The two main types of lenses are convex and concave lenses. Convex lenses, which are thicker in the middle, converge light rays to a focal point and can produce real or virtual images. Concave lenses are thinner in the middle and diverge light rays, producing only virtual images that are upright and smaller than the object.

3. What is the significance of the focal point in mirrors and lenses?

Ans. The focal point is the point where light rays either converge or appear to diverge after reflecting from a mirror or refracting through a lens. In concave mirrors and convex lenses, the focal point is real and lies on the side where light converges. In convex mirrors and concave lenses, the focal point is virtual, located behind the surface, and is important for understanding image formation and magnification.

4. How do we determine the nature and size of the image formed by mirrors and lenses?

Ans. The nature and size of the image can be determined by using the mirror formula for mirrors (1/f = 1/v + 1/u) and the lens formula for lenses (1/f = 1/v - 1/u), where f is the focal length, v is the image distance, and u is the object distance. By analyzing the signs and values of these distances, we can ascertain whether the image is real or virtual, upright or inverted, and its relative size compared to the object.

5. What are some practical applications of mirrors and lenses?

Ans. Mirrors and lenses have numerous practical applications. Mirrors are used in everyday items like bathrooms and vehicles for visibility. Concave mirrors are used in telescopes and shaving mirrors to magnify images, while convex mirrors are used in security mirrors for a wider field of view. Lenses are found in glasses, cameras, microscopes, and projectors, enhancing vision and enabling detailed observations of objects.

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