colour of the sun at sunrise and sunset

(a)  

The phenomenon of scattering of light through colloidal particles

(a)  

The twinkling of stars occur due to

(a)  

White light can splits in to how many component colours

(a)  

Hypermetropia is correct by using (a)   lens

Presbyopia is caused dut to (a)   in persons

how much minimum centimeter distance aperson can able to see comfortably

(a)  

The back surface of the eye is called as (a)  

The eye lens is (a)   in nature