Ray Optics and Optical Instruments MCQs Class 12
Ray Optics and Optical Instruments MCQs Class 12
Class: 12 | Subject: Physics
Section: 6 – Optics
Topic: Ray Optics and Optical Instruments
Based on: CBSE Board Examination Pattern
Section: 6 – Optics
Topic: Ray Optics and Optical Instruments
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 12 Board Examination preparation.
1. Laws of reflection are valid for:
Answer: C
The laws of reflection hold true for all types of reflecting surfaces irrespective of shape.
The laws of reflection hold true for all types of reflecting surfaces irrespective of shape.
2. A real image formed by a mirror is always:
Answer: B
Real images are formed by actual intersection of rays and are inverted.
Real images are formed by actual intersection of rays and are inverted.
3. Refractive index depends on:
Answer: D
Refractive index varies with wavelength, medium, and temperature.
Refractive index varies with wavelength, medium, and temperature.
4. Total internal reflection occurs when light travels from:
Answer: B
It requires denser → rarer medium and angle > critical angle.
It requires denser → rarer medium and angle > critical angle.
5. Mirage formation is due to:
Answer: C
Light bends through air layers and undergoes TIR.
Light bends through air layers and undergoes TIR.
6. Optical fibre works on:
Answer: C
Total internal reflection guides light.
Total internal reflection guides light.
7. Power of lens unit:
Answer: B
Dioptre = 1/f (metre).
Dioptre = 1/f (metre).
8. Concave mirror used in:
Answer: A
Produces magnified erect image near focus.
Produces magnified erect image near focus.
9. Convex mirror image is:
Answer: C
Always virtual, erect, diminished.
Always virtual, erect, diminished.
10. Telescope magnifies:
Answer: B
Angular magnification.
Angular magnification.
11. Microscope uses:
Answer: A
Objective + eyepiece.
Objective + eyepiece.
12. Prism disperses light due to:
Answer: B
Different refractive indices.
Different refractive indices.
13. Rainbow forms due to:
Answer: B
Combined optical effects.
Combined optical effects.
14. Critical angle depends on:
Answer: D
Via refractive index.
Via refractive index.
15. Plane mirror magnification:
Answer: A
Image same size.
Image same size.
16. Myopia corrected by:
Answer: B
Diverging lens.
Diverging lens.
17. Hypermetropia corrected by:
Answer: A
Converging lens.
Converging lens.
18. Cataract affects:
Answer: B
Lens becomes opaque.
Lens becomes opaque.
19. Least deviation occurs when prism is in:
Answer: B
Angle of incidence = emergence.
Angle of incidence = emergence.
20. Resolving power measures:
Answer: B
Ability to distinguish close objects.
Ability to distinguish close objects.
