NCERT Class 8 Science MCQ | Chapter 10: Light: Mirrors and Lenses
1. What is a spherical mirror?
(A) A mirror with a flat reflecting surface
(B) A mirror whose reflecting surface is part of a spherical surface
(C) A mirror made only of plastic
(D) A mirror that allows light to pass through it
Answer: (B) A mirror whose reflecting surface is part of a spherical surface
2. A spherical mirror whose reflecting surface curves inwards is called a:
(A) Convex mirror
(B) Plane mirror
(C) Concave mirror
(D) Transparent mirror
Answer: (C) Concave mirror
3. A spherical mirror whose reflecting surface curves outwards is called a:
(A) Concave mirror
(B) Convex mirror
(C) Plane mirror
(D) Cylindrical mirror
Answer: (B) Convex mirror
4. When the inner curved surface of a shiny spoon is used as a mirror, the image can appear:
(A) Always erect and smaller
(B) Inverted
(C) Always the same size
(D) Completely invisible
Answer: (B) Inverted
5. What type of image is always formed by a convex mirror?
(A) Erect and diminished
(B) Inverted and enlarged
(C) Erect and enlarged
(D) Inverted and same size
Answer: (A) Erect and diminished
6. When an object is placed close to a concave mirror, its image is generally:
(A) Erect and enlarged
(B) Erect and diminished
(C) Inverted and diminished
(D) Always the same size
Answer: (A) Erect and enlarged
7. Which type of mirror is commonly used as a side-view mirror in vehicles?
(A) Plane mirror
(B) Concave mirror
(C) Convex mirror
(D) Flat glass plate
Answer: (C) Convex mirror
8. Why are convex mirrors used as side-view mirrors?
(A) They form enlarged images
(B) They provide a wider field of view
(C) They form inverted images
(D) They concentrate light
Answer: (B) They provide a wider field of view
9. Which type of mirror is used as a reflector in torches and vehicle headlights?
(A) Convex mirror
(B) Plane mirror
(C) Concave mirror
(D) Glass slab
Answer: (C) Concave mirror
10. Why is a concave mirror useful as a dental mirror?
(A) It gives a diminished image
(B) It can provide an enlarged view when the object is close
(C) It always gives an inverted image
(D) It allows light to pass through
Answer: (B) It can provide an enlarged view when the object is close
11. What is the ray of light that falls on a reflecting surface called?
(A) Reflected ray
(B) Normal ray
(C) Incident ray
(D) Refracted ray
Answer: (C) Incident ray
12. What is the ray of light that comes back from a reflecting surface called?
(A) Incident ray
(B) Reflected ray
(C) Normal ray
(D) Absorbed ray
Answer: (B) Reflected ray
13. What is the normal at the point of incidence?
(A) A line parallel to the mirror
(B) A line making 90° with the mirror surface at the point of incidence
(C) The reflected ray
(D) The incident ray
Answer: (B) A line making 90° with the mirror surface at the point of incidence
14. The angle between the incident ray and the normal is called the:
(A) Angle of reflection
(B) Angle of incidence
(C) Angle of deviation
(D) Angle of refraction
Answer: (B) Angle of incidence
15. According to the law of reflection:
(A) Angle of incidence is always greater than angle of reflection
(B) Angle of incidence is equal to angle of reflection
(C) Angle of incidence is always zero
(D) Angle of reflection is always 90°
Answer: (B) Angle of incidence is equal to angle of reflection
16. The incident ray, normal, and reflected ray at the point of incidence:
(A) Always lie in different planes
(B) Lie in the same plane
(C) Never meet
(D) Are always parallel
Answer: (B) Lie in the same plane
17. When a beam of parallel light rays falls on a concave mirror, the reflected rays:
(A) Remain parallel
(B) Converge
(C) Diverge
(D) Stop completely
Answer: (B) Converge
18. When a beam of parallel light rays falls on a convex mirror, the reflected rays:
(A) Converge
(B) Remain parallel
(C) Diverge
(D) Become absorbed
Answer: (C) Diverge
19. What is a lens?
(A) An opaque material with a flat surface
(B) A transparent material with curved surfaces
(C) A metallic reflecting surface
(D) A material that completely absorbs light
Answer: (B) A transparent material with curved surfaces
20. A lens that is thicker at the middle than at the edges is called a:
(A) Concave lens
(B) Convex lens
(C) Plane mirror
(D) Convex mirror
Answer: (B) Convex lens
21. A lens that is thicker at the edges than at the middle is called a:
(A) Convex lens
(B) Concave lens
(C) Plane mirror
(D) Concave mirror
Answer: (B) Concave lens
22. Which lens is also called a converging lens?
(A) Concave lens
(B) Convex lens
(C) Plane glass
(D) Concave mirror
Answer: (B) Convex lens
23. Which lens is also called a diverging lens?
(A) Convex lens
(B) Concave lens
(C) Plane mirror
(D) Convex mirror
Answer: (B) Concave lens
24. What type of image is always formed by a concave lens according to the chapter?
(A) Erect and diminished
(B) Inverted and enlarged
(C) Erect and enlarged
(D) Inverted and same size
Answer: (A) Erect and diminished
25. Which of the following uses lenses?
(A) Eyeglasses
(B) Cameras
(C) Telescopes and microscopes
(D) All of the above
Answer: (D) All of the above
NCERT Class 8 Science MCQ | Chapter 10: Light: Mirrors and Lenses
Assertion–Reason Questions
Directions:
Choose the correct option:
(A) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(B) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(C) Assertion is true, but Reason is false.
(D) Assertion is false, but Reason is true.
1. Assertion: Convex mirrors are used as side-view mirrors in vehicles.
Reason: Convex mirrors provide a wider area of view and form erect, diminished images.
Answer: (A)
2. Assertion: A concave mirror can form an enlarged image when an object is placed close to it.
Reason: When the object is placed close to a concave mirror, the image formed is erect and larger than the object.
Answer: (A)
3. Assertion: The angle of incidence is equal to the angle of reflection.
Reason: The incident ray, the normal, and the reflected ray all lie in the same plane.
Answer: (B)
4. Assertion: A convex mirror diverges parallel rays of light.
Reason: Its reflecting surface curves outwards, causing the reflected rays to spread apart.
Answer: (A)
5. Assertion: A convex lens is called a converging lens.
Reason: A convex lens makes parallel beams of light come closer together after passing through it.
Answer: (A)
