Class 10 Science Chapter 2: Key Points to Remember on Optics

Optics: Key Points to Remember

Chapter 2: Optics Summary

Light is a form of energy which travels along a straight line.
The deviation in the path of light ray is called refraction.
The ratio of speed of light in vacuum to the speed of light in a medium is defined as refractive index ‘µ’ of that medium.
Lens formula:
Magnification (m) is given by \( m = \frac{h'}{h} = \frac{v}{u} \).
Power of lens, \( P = \frac{1}{f} \).
The ability of the eye to focus nearby as well as the distant objects is called power of accommodation of the eye.
A microscope is an optical instrument which helps us to see the objects which are very small in dimension.
Telescope is an optical instrument used to see the distant objects clearly.