# Ray Optics
This course starts with basic introduction to reflection, refraction to some advanced topics like lenses, prism etc.
# Plane Mirror : Part 1
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Video: https://unacademy.com/lesson/plane-mirror-part-1/ZVVAWXM5 (opens new window)
# Plane Mirror : Part 2
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Video: https://unacademy.com/lesson/plane-mirror-part-2/K9DVP8HT (opens new window)
# Spherical Mirrors : Introduction, Def of Focus
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Video: https://unacademy.com/lesson/spherical-mirrors-introduction-def-of-focus/0C422DGR (opens new window)
# Snells Law, Refractive Index of a Medium
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Video: https://unacademy.com/lesson/snells-law-refractive-index-of-a-medium/47S893WB (opens new window)
# Critical Angle, Total Internal Reflection
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Video: https://unacademy.com/lesson/critical-angle-total-internal-reflection/070QKX9Z (opens new window)
# Concave, Covex Spherical Surface - Part 1
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Video: https://unacademy.com/lesson/concave-covex-spherical-surface-part-1/RVRKXP49 (opens new window)
# Thin Lenses : First and Second Focus
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Video: https://unacademy.com/lesson/thin-lenses-first-and-second-focus/EFZTITLH (opens new window)
# Lens makers Formula and Lens Formula
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Video: https://unacademy.com/lesson/lens-makers-formula-and-lens-formula/ZM83GCCC (opens new window)
# Displacement Method : Determination of Focal Length of a Lens
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# (Theory) Focal Length of Combination of Lenses
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# (Numerical) Focal Length of Combination of Lenses
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# Quality Numerical 001 : Refraction and Reflection simultaneously
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# Quality Numerical 002 : Apparent Depth
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Video: https://unacademy.com/lesson/quality-numerical-002-apparent-depth/DZYXY3S9 (opens new window)
# Quality Numerical 003 : Lens Placed in Different Mediums
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# Quality Numerical 004 : Refraction and Reflection
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# Quality Numerical 005 : Silvered Convex Lens
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Video: https://unacademy.com/lesson/quality-numerical-005-silvered-convex-lens/GKYQCGRN (opens new window)