When light passes from air to a medium its speed reduces to 40%. The velocity of light in air is 3 × 108 ms-1. What is refractive index of the medium?
When light passes from air to a medium its speed reduces to 40%. The velocity of light in air is 3 × 108 ms-1. What is refractive index of the medium?
Ans: – We know, refractive index(u) = c/v,
Here, c= 3 × 10^8 m/s.
And, v= c × 40/100 = 1.2 × 10^8 m/s.
So, u= 3 × 10^8 / 1.2 × 10^8 = 5/2.
When sunlight is passed through prism, it splits into seven colours as shown in Fig. By numbers write corresponding colours.
Ans: –
How do r and δ change for same angle of incidence i if the prism shown in Fig.is immersed in water
Ans: –
Why does white light split into seven colours when it passes through a prism?
Ans: – The different colours or prism because of the all seven colours have different refractive index so when it passes through prism show this phenomenon.
Write a natural phenomenon of dispersion of light.
Ans: – Rainbow is the phenomenon of dispersion of light.
- Follow on Facebook page – Click Here
- Google News join in – Click Here