How can a change in the size of the eyeball be a reason for $(a)$ Myopia and $(b)$ Hypermetropia? Compare the size of the eyeball with that of a normal eye in each case. How does this change in size affect the position of the image in each case?

The eye defect known as $Presbyopia$ is corrected by using a $........$ lens.

$A$ glass slab is placed over a page on which the word $VIBGYOR$ is printed with each letter in its corresponding colour. $(i)$ Will the image of all the letters be in the same place? $(ii)$ If not, state which letter will be raised to the maximum. Give a reason for your answer.

Which phenomenon of light is responsible for the Tyndall effect?

In the dispersion of white light by a prism,which color of light undergoes the maximum deviation?

Due to atmospheric refraction of light,the Sun appears to rise $................$ its actual sunrise.