Class 10 Science Chapter 9: Light – Reflection and Refraction — practice questions with answers
Free practice for Class 10 Science, Chapter 9: Light – Reflection and Refraction. Try the solved questions below, then take a free test with instant marking and explanations.
56 questions24 easy, 24 medium, 8 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. According to the laws of reflection, the angle of incidence is ______ the angle of reflection.
- equal to
- greater than
- less than
- twice
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Answer: A. equal to
Why: The incident ray, normal and reflected ray also lie in one plane. [p.134]
Why: The incident ray, normal and reflected ray also lie in one plane. [p.134]
Q2. The centre of the reflecting surface of a spherical mirror is called its ______.
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Answer: pole
Why: It is denoted by P. [p.135]
Why: It is denoted by P. [p.135]
Q3. For spherical mirrors of small aperture, the radius of curvature R and focal length f are related by ______.
- R = 2f
- f = 2R
- R = f
- R = f/4
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Answer: A. R = 2f
Why: The principal focus lies midway between the pole and the centre of curvature. [p.137]
Why: The principal focus lies midway between the pole and the centre of curvature. [p.137]
Q4. Which mirror is used as a rear-view mirror in vehicles?
- Convex mirror
- Concave mirror
- Plane mirror
- Cylindrical mirror
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Answer: A. Convex mirror
Why: It gives an erect, diminished image and a wider field of view. [p.142]
Why: It gives an erect, diminished image and a wider field of view. [p.142]
Q5. The SI unit of the power of a lens is ______.
- dioptre
- metre
- watt
- joule
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Answer: A. dioptre
Why: 1 D is the power of a lens of focal length 1 m. [p.158]
Why: 1 D is the power of a lens of focal length 1 m. [p.158]
Q6. The bending of light when it passes from one medium to another is called ______.
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Answer: refraction
Why: Light changes speed at the boundary. [p.134]
Why: Light changes speed at the boundary. [p.134]
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Frequently asked questions
How many practice questions are there for Class 10 Science Chapter 9: Light – Reflection and Refraction?
56 questions (24 easy, 24 medium, 8 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 10 Science syllabus, used by CBSE and many state boards.