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?

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.c) Indicate the positions of the mirrors in the figure.

An object is placed at a distance of 30 cm from a converging lens of focal length 15 cm. A normal eye (near point 25 cm, far point infinity) is placed close to the lens on the other side. (a) Can the eye see the object clearly? (b) What should be the minimum separation between the lens and the eye so that the eye can clearly see the object?

A person has farsightedness with the minimum distance he could see early is 75 cm. Calculate the poer of the spectacts necessary to recify the defect.

By mistake, an eye surgeon puts a concave lens in place of the lens in the eye after a cataract operation. Will the patient be able to see clearly any object placed at any distance?

A lady uses + 1.5 D glasses to have normal vision from 25 cm onwards. She uses a 20 D lens as a simple microscope to see an object. Find the maximum magnifying power if she uses the microscope (a) together with her glass (b) without the glass. Do the answers suggest that an object can be more clearly seen through a microscope without using the correcting glasses?

A person with myopia can see objects plaecd at a distance of 4 m. if he wants to see objects at a distance of 20 m, what should be the focal length and power of the concave lens he must wear?

A Farmer is cultivating different vegetable crops in a field. One day he could see white rust symptoms of Albugo destroying the Greens but all other crops are found healthy. He reports this observation to you. Can you find out the reason why this pathogen has not attacked other vegetable crops