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Formula Sheet

Ray Optics and Optical Instruments — Formula Sheet

BITSAT · Physics

Free Ray Optics and Optical Instruments formula sheet for BITSAT Physics 2026 — all important formulas, equations, and constants for quick reference.

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An illustration showing light traveling in straight lines from a point source, casting sharp shadows, demonstrating the principle of rectilinear propagation.
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Formula Sheet — Ray Optics and Optical Instruments

Important formulas and equations from Ray Optics and Optical Instruments for BITSAT Physics.

Formulas — Ray Optics and Optical Instruments

Basic Laws and Reflection

∠i = ∠r
Number of images = 360°/θ - 1 (for even N) or N (for odd N)
R = 2f

Spherical Mirrors

1/v + 1/u = 1/f
m = -v/u = hi/ho
ml = -v²/u² = -(m)²
vi/M = -(v²/u²) × vo/M

Refraction and Snell's Law

μ₁ sin i = μ₂ sin r
μ = c/v
d = t sin(i-r)/cos r
Apparent depth = Real depth/μ

Total Internal Reflection

sin ic = μ₂/μ₁
ic = sin⁻¹(1/μ)

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Frequently Asked Questions

What topics are covered in Ray Optics and Optical Instruments for BITSAT?
Ray Optics and Optical Instruments is an important chapter in BITSAT Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Reflection of Light by Spherical Mirrors, Refraction of Light, Refraction at Spherical Surfaces and Thin Lenses, Refraction Through Prism.
How important is Ray Optics and Optical Instruments for BITSAT?
Ray Optics and Optical Instruments is a frequently tested chapter in BITSAT Physics. Questions from this chapter appear regularly in previous year papers. There are 353 practice questions available for this chapter.
How to prepare Ray Optics and Optical Instruments for BITSAT?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.

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