Important points to remember

Speed of light is maximum in vaccum.
Shaped diamond shines due to high refractive index and total internal refraction.
Candela is the unit of luminous intensity.
Power of lenses is measured in diopter.
Longitudinal waves cannot be polarised.
If an object placed between two parallel mirrors than infinite objects will be formed.
Rainbow always formed in a direction opposite to the sun.
Lumen is unit of luminous index.
The frequency of visible light varies between 400nm to 700nm
Colour blindness was first discovered by Horner
Focal distance of lens is maximum for red-light and minimum for violet light.
3D image is known as hologram
If a transparent material is invisible in any liquid then both of them have the same refractive index.
Magnifying glass is convex lens of small focal length.
If two mirrors are at an angle of 75 degree then the number of images is 5.
Human eyes have convex lens.
Raman effect is related to scattering.
For glass palate having refractive index 1.54 polarising angle is 57 degree.

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