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?

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 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?

Condier the following problem. A manufacture produced tables and chairs. It takes 3 hours of work on machine A mind 1 hour of work on machine B to produce one table and 2 hours of work on machine A and 3 hours on machine B to produce 1 chair . He erars a profit fo Rs. 50 per table and Rs 40 per chair. Hoperates the machines a and B for atmost 12 hours hours respectively. how many tables and chairs should be produce each day to maximise his profit ? (i) Write the objective function. (ii) Write the constrains.

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 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.

A gardener wanted to reward a boy for his good deeds by giving some mangoes. He gave the boy two choices. He could either have 1000 mangoes at once or he could get 1 mango on the first day, 2 on the second day, 4 on the third day, 8 mangoes on the fourth day and so on for ten days. Which option should the boy choose to get the maximum number of mangoes?

Sha went to a doctor and said that he could not see distant objects clearly. Doctor tested and prescribed a lens of power - 0.75 D. a. what is the eye defect of sha ? b. Why did the doctor prescribe a lens - 0.75 D ? c. What type of lens is this ?