### Sindh Board > 9th > Physics (Total Videos: 24)

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##### Chapter 9: Optics (5 videos)
###### 9.1: Focal length of lens
1. Find focal length of convex lens by parallax method
###### 9.2: Focal length of mirror
1. Determine focal length of concave mirror by one needle
###### 9.3: Laws of refraction
1. Verify laws of refraction of light by using glass slab
###### 9.4: Optical properties of glass prism
1. Trace path of light through prism & measure deviation angle done
###### 9.5: Laws of relection
1. Verify laws of reflection by using plane mirror