Chapter Mock Test
Total Marks:35
Duration:90 min
Total Questions:25
Difficulty:Mixed
Test Structure
- —Section A: 10 MCQs (1 mark each)
- —Section B: 8 Short Answer (2-3 marks each)
- —Section C: 4 Long Answer (5 marks each)
- —Total: 25 questions in 90 minutes
Before taking the test
- —Know all key formulas: Mirror (1/f=1/v+1/u), Snell's law (n₁sinθ₁=n₂sinθ₂), Lens formula (1/f=1/u+1/v)
- —Understand sign convention: Concave mirror f positive, Convex mirror f negative
- —Practice ray diagrams for all mirror and lens positions to visualize image formation
- —Remember: Light bends TOWARD normal entering denser medium, AWAY from normal entering rarer medium
- —Practice numerical problems on refraction, critical angle, and total internal reflection
- —Know power of lens P = 1/f (with f in metres) and how to combine lenses
- —Understand applications: Telescopes (long f objective + short f eyepiece), Microscopes, Periscopes, Optical fibres (TIR)
- —Be clear on difference between real images (inverted, can project) and virtual images (erect, cannot project)
Must-Know Formulas
Mirror Formula:
1/f = 1/u + 1/v
Snell's Law:
n₁ sin i = n₂ sin r
Lens Formula:
1/f = 1/u + 1/v
Power of Lens:
P = 1/f (f in metres)
Magnification:
m = -v/u (mirror), m = v/u (lens)
Critical Angle:
sin θc = n₂/n₁ = 1/n
Refractive Index:
n = c/v
Focal Length:
f = R/2
Related Resources
- Questions & Answers
Complete Q&A with very short, short, and long answer questions
- MCQs
20 multiple choice questions with detailed explanations
- Revision Notes
Quick revision of key points, formulas, and common mistakes
- Main Content
Full chapter explanation with diagrams and examples