A _______ reflection helps us to see the objects.

Are leeches helpful to us?

__________ are used to view the objects on the surface of the earth.

Ram planned an activity to observe an object through pipes as shown in figure,so that he could see objects which he could not directly see.a) Mention how many mirrors should he use to see the object.

Ram planned an activity to observe an object through pipes as shown in figure,so that he could see objects which he could not directly see.b)If any of the mirrors is removed,will he be able to see the objects?

A farsighted person cannot see objects placed closer to 50 cm. Find the power of the lens needed to see the objects at 20 cm.

The _________ tool helps us to draw freehands drawings.

The shape of an object helps to determine whether the object will float.

A nearsighted person cannot see beyond 25 cm. Assuming that the separation of the glass from the eye is 1 cm, find the power of lens needed to see distant objects.

Ciliary muscles help to change the ________ of the eye lens according to the position of the object.