Accommodation means the adjustment of light going into the eye for image formation.

Which phenomenon is responsible for the blue color of the clear sky?

$(a)$ What is dispersion of white light? What is the cause of such dispersion? Draw a diagram to show the dispersion of white light by a glass prism.
$(b)$ $A$ glass prism is able to produce a spectrum when white light passes through it,but a glass slab does not produce any spectrum. Explain why this is so.

Define dispersion of white light.

Give one example in nature where we can see the dispersion of white light.

The far point of a myopic person is $40 \, cm$. What type of lens should they wear to see distant objects clearly? Calculate the focal length and the power of the lens they should use.