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5. 1) Take a metal tray and fill it with water.
2) Place a mirror in the water such that it makes an angle with water surface.
3) Now focus white light on the mirror
4) through the water as shown in figure. 4. Keep a white card board sheet
above the water surface.
5) We can observe the colours VIBGYOR on the board.
6) The splitting of white light into different colours (VIBGYOR) is called dispersion.
7) So consider a white light is a collection of waves with different wavelength.
8) Violet has shortest wavelength and red has longest wavelength.
1. A normal eye is unable to clearly see the objects placed closer than 25 cm because the ciliary muscles of eyes are unable to contract
beyond a certain limit.
2. The ciliary muscles which attached with eye lens help to change the focal length of the eye lens. When the eye is focussed on a distant object, these are relaxed so the focal length of eye lens increases to its maximum value.
3. Myopia can be corrected by wearing glasses/contacts with concave lenses these help to focus the image on the retina. Hyperopia: (farsightedness) This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily. The image is focused behind the retina rather than upon it.
4. Then the refractive index formula
using angle of prism and deviation is used to find the refractive index of the material of the prism. Formula Used: The formulae used in the solution are given here. →n = sin[(A+D)2] / sinA2 where nis the refractive index of the prism, A is the angle of prism and d is the deviation.
5. answer is at the top
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