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Optics
If the focal length of a convex lens is 1 m, what is the maximum thickness of the lens?
Optics
A beam of unpolarised light is incident on a detector measuring its intensity. Two linear polarisers and two half-wave plates are provided. The orientations of the fast and slow axes on the wave-plates are not marked. Suggest and explain a method for alignment of the axes of the two wave-plates. Is it possible to distinguish the following two configurations when (a) the fast axes of the wave-plates are aligned and (b) the fast and slow axes of the wave-plates are aligned? Justify your answer using appropriate mathematical derivations describing the modification of light polarisation when it propagates through the system of two linear polarisers and two wave-plates. [7 marks]
Optics
An object of size 10cm is kept at a distance of 10cm from a convex lens. If the focal length of the lens is 5cm, the size of the image is
Optics
A reflecting, spherical Christmas tree ornament has a diameter of 7.0 cm. A child looks at the ornament from a distance of 28 cm. Describe the image she sees.
Answer: -1.65cm
How? I've tried many methods, even the one on here but am still getting a way different number.
Answer: -1.65cm
How? I've tried many methods, even the one on here but am still getting a way different number.
Optics
convex mirrors are usually used as
magnifying glasses
driving mirrors
dentist mirror
artist mirror
magnifying glasses
driving mirrors
dentist mirror
artist mirror
Optics
The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say b min) when
Optics
why our fingers appeared red when we put it on a torch(mobile torch etc)
Optics
how many lines must a grating have, used in the second order and near 550 nano meter, to resolve two lines 0.1 angstrom apart ?
Optics
Ordinary white passes through a diffraction grating having 10,000 slits per centimeter, i.e. a slit separation of d = 1.00 X 10-6 m, and casts a diffraction pattern on a screen. You measure the angular separation between the central white fringe and the blue stripe in the first (m = 1) rainbow as 23.6 degrees. From this information, calculate the wavelength of blue light.
Optics
the slit increased,the separation distance between two consecutive bright bonds will decreases.Explain?
