Which color is produced by mixing blue and red?

$(a)$ Explain the phenomenon of scattering of light. State the factor on which the colour of scattered light depends.
$(b)$ List any two natural phenomena based on the scattering of light.

What is Tyndall effect?

$(a)$ What is meant by the least distance of distinct vision?
$(b)$ How does the thickness of the eye lens change when we shift our focus from a distant tree to reading a book?

What happens when white light is incident on a white object?

Which colour has the maximum wavelength and which has the minimum wavelength? Explain on the basis of wavelength which colour bends the most and which colour bends the least.