Does the image of the sun become smaller or bigger ?

How does it possible to get the image at the same distance on the retina ?

When does the average velocity become zero ?

Ammer said "Bigger onion has larger cells when compared to the cells of smaller onion". Do you agree the with his statement or not? Explain why?

We wish to obtain an erect image of an object using a concave mirror of focal length of 15 cm. What should be range of distance of the object from the mirror ? What is the nature of the image ? Is the image larger or smaller than the object ?

A block of mass M is placed on the top of a bigger block of mass 10M as shown in fig. All the surfaces are frictionless. The system is releated from rest. The distance moved by the bigger block by the time the smaller block reaches the ground is