All formulas from the ‘Light’ chapter.

By BYJU'S Exam Prep

Updated on: September 13th, 2023

All the important formulas from the chapter ‘Light’ are given below

1. Radius of curvature = 2 x focal length = 2f

2. Snell’s formula n = sin i/ sin r

Where i is the angle of incidence

r is the angle of refraction

3. Absolute refractive index n = speed of light in vacuum/ speed of light in medium

4. Lens formula 1/v – 1/u = 1/f

5. Mirror formula 1/v + 1/u = 1/f

Where f is the focal length

u is the image distance

f is the object distance

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6. Combine the power of two or more lenses

P = P1 + P2 + P3 + …..

7. Relative refractive index n21 = speed of light in medium 1/ speed of light in medium 2

8. Power of a lens P = 1/focal length

9. Magnification (mirror) = height of image/ height of object

= hi/ho

= -v/u

Where hi is image height

ho is object height

Therefore, all the formulas from the ‘Light’ chapter are mentioned above.

Summary:

All the formulas from the ‘Light’ chapter are mentioned above.

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