LIGHTING & LENSING WORKSHOP DAY -2

Last hour preparation-

I reached Department of Direction & SPW at around 9:30 in the morning with little worries in my mind as I haven’t done my assignment.  I walk into the classroom and saw some of my friends.  I asked to them, whether they have finish the assignment or not, some says they did it and some says they don’t.  I was a bit relieved as I was not the only one but still I felt myself as irresponsible person.  So, I went to internet room to do my assignment as it was a bit early for the class to begin.

Few minutes later-

First session-

I switched off my phone and place it on the table. There are four or five phones on the table. I take my seat and waits for the teacher to come. After some minutes, Sir comes in with a gentle smile and asks us whether everybody has done the task of the previous day i.e blogging.  Some says they did it, some says they don’t and some says it’s on half way. But me, I said nothing. 

As he listens to our answer, he says he can’t proceed today class unless everyone submit the previous day task. He says he will meet us at 2 in the afternoon. He gives us a day break to finish the task.

After he left, we discuss ourselves and start doing the assignment till we finished.

It was of course my fault as I have not completed the task. I felt my mistakes.

Second session-

Second session starts with the discussion of tackling the problem. We all give our view point’s relating to solve the problem. It went on and on till 3.30 pm.

At around 4pm, everyone of us makes a pin hole camera. We completed by 5.20 in the evening and tested our pin hole camera through tube light.

QUESTIONS-

1. If the human eye has a lens of variable focal length then why doesn’t the image magnification change when the focal length changes, i.e. why can’t we zoom in as we do in a camera?

A- we can't zoom in or out in human eye because human eye has simple lens set up. For zooming , it needs to increase or decrease the image size which can be done with a compound lens set up like in camera.

2.Post eye surgery, how does the newly implanted lens adapt to the “accommodation” mechanism of the eye?

A- The most important change has been the development and improvement of artificial replacement lenses. These plastic lens implants are only one-quarter of an inch wide and can be permanently inserted into the eye to replace the cloudy lens that has been removed. Artificial lens implants have improved over time. So have the surgical techniques we use to remove the cataract. We now use a small incision method called phacoemulsification, which uses a tiny vibrating blunt needle to ultrasonically break up the cloudy lens into fragments that are gently removed through the same needle. This is microsurgery — the surgeon uses a microscope to operate through a tiny incision measuring less than one-eighth of an inch wide. The incision is so small that it typically does not require sutures and there is no bleeding. The goal of he newest artificial lenses, which are called multifocal lenses. These are designed to produce a dual focus, where part of the lens is set for distance focus, and part of the lens is set for near. The design is entirely different from bifocal eyeglasses, however, where you look through the top portion for distance and the bottom area for near. With a multifocal lens implant the brain automatically finds the correct focus.