Light – Reflection and Refraction Class 10 MCQs
Light – Reflection and Refraction Class 10 MCQs
Class: 10 | Subject: Science | Section: Physics
Topic: Light – Reflection and Refraction
Based on CBSE Board Examination Pattern
Topic: Light – Reflection and Refraction
Based on CBSE Board Examination Pattern
Instructions: These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 10 Science Board Examination standard.
1. The angle between the incident ray and the normal is called:
Answer: C. Angle of incidence
Explanation: It is the angle made by the incident ray with the normal at the point of incidence.
Explanation: It is the angle made by the incident ray with the normal at the point of incidence.
2. Laws of reflection are applicable to:
Answer: D. All reflecting surfaces
Explanation: The laws of reflection hold true for all types of mirrors and reflecting surfaces.
Explanation: The laws of reflection hold true for all types of mirrors and reflecting surfaces.
3. Image formed by a plane mirror is:
Answer: B. Virtual and erect
Explanation: Plane mirrors always form virtual, erect images of same size.
Explanation: Plane mirrors always form virtual, erect images of same size.
4. The focal length of a plane mirror is:
Answer: A. Infinite
Explanation: A plane mirror has infinite radius of curvature, hence infinite focal length.
Explanation: A plane mirror has infinite radius of curvature, hence infinite focal length.
5. A concave mirror forms a real image when object is placed:
Answer: C. Beyond focus
Explanation: Real and inverted images are formed when object is beyond focal point.
Explanation: Real and inverted images are formed when object is beyond focal point.
6. Convex mirrors are used as rear-view mirrors because they:
Answer: C. Provide wider field of view
Explanation: Convex mirrors diverge light and show more area behind vehicles.
Explanation: Convex mirrors diverge light and show more area behind vehicles.
7. Unit of power of a lens is:
Answer: B. Dioptre
Explanation: Power = 1/f (f in metres). Unit is Dioptre (D).
Explanation: Power = 1/f (f in metres). Unit is Dioptre (D).
8. SI unit of focal length is:
Answer: C. metre
Explanation: Focal length is a length quantity.
Explanation: Focal length is a length quantity.
9. Refraction occurs because of change in:
Answer: A. Speed of light
Explanation: Light bends due to change in speed in different media.
Explanation: Light bends due to change in speed in different media.
10. Refractive index depends on:
Answer: D. All of these
Explanation: Refractive index varies with wavelength, medium and temperature.
Explanation: Refractive index varies with wavelength, medium and temperature.
11. Mirror formula is:
Answer: B
Explanation: Standard mirror formula relation.
Explanation: Standard mirror formula relation.
12. Lens formula is:
Answer: A
Explanation: Applicable to both convex & concave lenses.
Explanation: Applicable to both convex & concave lenses.
13. Concave lens always forms:
Answer: B
Explanation: Always virtual, erect, diminished.
Explanation: Always virtual, erect, diminished.
14. Convex lens is also called:
Answer: B
Explanation: It converges parallel rays.
Explanation: It converges parallel rays.
15. Power of lens increases when focal length:
Answer: B
Explanation: Power = 1/f.
Explanation: Power = 1/f.
16. Real images can be obtained on:
Answer: A
Explanation: Real rays meet physically.
Explanation: Real rays meet physically.
17. Sign convention follows:
Answer: A
Explanation: Distances measured from pole.
Explanation: Distances measured from pole.
18. When light enters denser medium it bends:
Answer: B
Explanation: Speed decreases → bends towards normal.
Explanation: Speed decreases → bends towards normal.
19. Twinkling of stars is due to:
Answer: B
Explanation: Atmospheric refraction.
Explanation: Atmospheric refraction.
20. Absolute refractive index of vacuum is:
Answer: B
Explanation: It is the reference medium.
Explanation: It is the reference medium.