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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Jun 2008 00:09:17 IST
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Q1 Can a virtual image be photographed????
Q2 Can a virtual object produce a real image????
Q3 Why it is unadvisable to leave small droplets of water on a car in bright sunlight????
Q4 Does a flat glass slab display dispersion?????
Q5 When light passes from one medium to another,the wavelength changes.Does the colour also change???
Q6 Do light rays always travel in straight line???(tricky)
PLZZZZZZZZZZ DONT ANSWER IN YES OR NO................XPLAIN YOUR ANSWER..........
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"You need a perfect strategy to clear JEE more than knowledge " |
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17 Jun 2008 00:21:52 IST
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1 ans is no ..because virtual images r made in a convex mirror and in concave lens...the virtual image appears to meet at a point but actually they rn;t so cant be taken on screen and cant be photographed
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17 Jun 2008 09:25:45 IST
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1- NO. Virutal images cant be obtained on a screen and how can u take photograph of something which cant be obtained on any screen.
2- First of all, I dont think it is pratically possible to have a virtual object. I mean there is no source which can produce converging rays(I am not sure abt this). If it can, then YES. Virtual object can produce a real image.
3- Maybe becoz they can act as small lenses(or magnifying glasses) and can magnify sunrays on a small area which cam damage car paint.
4-NO
5-NO. Becoz colour depends on the frequency of light. And Frequency is a function of source. Means for a same source, on changing mediums of travel, velocity and wavelength change but NOT frequency.
6-NO. The bending of light rays can be explained by wave nature of light as in case of diffraction.
Hope it helps you.
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17 Jun 2008 09:29:57 IST
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I think virtual image can be photographed. What if we take image of virtual image?
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17 Jun 2008 09:33:11 IST
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Virtual images are formed in convex mirror or concave lens. Can we photograph it?? Umm, I dont know. I think we shud try a practical. ;) :D
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
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17 Jun 2008 09:33:53 IST
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1. I think yes when we take virtual image as an object and produce a virtual image.
2.Related to first.
3.Same as Tarinbansal.
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17 Jun 2008 09:37:59 IST
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1- YES. We can take the photograph of our image in a plane mirror and our image in a plane mirror is also virtual. Which means we can take the photograph of a virtual image. :D
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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17 Jun 2008 09:38:53 IST
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Then i am correct?
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17 Jun 2008 09:47:48 IST
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4. I don't think so.
5.It may or may not change. If we consider a prism and white light enter to prism then it gets dispersed and thus change in color.This is only in this case.
6. No. It is due to diffraction.
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17 Jun 2008 10:27:48 IST
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1.Yes. They can be. Just try on a plane mirror. This is possible bcoz though rays are either parallel or divergent in case of a virtual image, camera has a biconvex lens, which converges the rays, so we get an real image, and hence a photo. ( u can try for urself )
2. Yes. By Using a convex lens or concave mirror. This is possible bcoz though rays are either parallel or divergent in case of a virtual image, convex lens or concave mirror converges the rays, so we get a real image.
3. Small drops act as lens, so concentrate sun rays hence, can damage the paint with incereased energy density.
4.Yes, it does, but very minimally. Look, we know lateral displacement depends on RI, and RI of each color is different, so the beam gets spread out width-wise. So colors get separated. ( Most Books tend to overlook this fact )
5.No. Color does not. On refraction, wavelength changes, frequency does not. Color ultimately depends on frequency.
6. It bends on refaction, reflection, diffraction. But when an infestimal amount of time is considered, it is straight.
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17 Jun 2008 10:34:08 IST
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1.Yes A virtual Image can be photographed. The Divergent rays from the virtual image are converged by the camera convex lens to produce a real image on the screen.
Sending other ans thru next mail
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18 Jun 2008 00:16:32 IST
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some more queries.............
Q7 How can we determine focal length of a diverging lens practically????
Q8 Why is it difficult for our eyes to form a clear image under water??How do goggles help?
Q9 Does the focal length of telescope affect the size of image of an object????
Q10 How does focussing of camera lens differ from that of crystalline lens of our eyes?????
Q11 What happens to the focal length of lens(convex or concave) when it is immersed in water???
Q12 Mirrors in amusement park make you look fat or small etc..How?????
Q13 How is focal length of mirror affected when it is immersed in water???
Q14 Why do wavefronts of ocean wave tend to approach a beach parallel to shore????
plzzzzzzz reply.............Post your doubts tooooooo
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18 Jun 2008 12:30:18 IST
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7- Keep the lens in front of a window frame or some object far away and get its image thru lens on a sheet of paper. The distance between the lens and sheet for which u get the sharpest image is the focal length of the lens.
8- Due to water's refractive index, the focal length of our eye lens changes and hence it is not able to diverge the incident rays on retina. When we put on goggles, the medium just outside our eye lens is again air, hence its focal length does not change now and now the incident rays are diverged properly on the retina to give us a clear image.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
Posts:
Can marks really judge a student??
Some myths about Chemical Engineering.
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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18 Jun 2008 12:44:34 IST
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12. They use concave or convex lens to form all this.
Concave to form large image and convex to form a diminished image.
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18 Jun 2008 13:03:23 IST
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