Recent questions in 12th Physics

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Write the relationship between angle of incidence i, angle of prism A and angle of minimum deviations from a triangular

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How does focal length of a lens change when red light incident on it is replaced by violet light? Give reason for your

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Name the physical quantity which remains same for microwaves of wavelength 1 mm and UV-radiation of `1600 A^0` in

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Under what condition, does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a

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For the same value of angle of y incidence, the angles of refraction in three media A, B and C are 15°, 25° and 35° respectively. In which medium, would the velocity of light be

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When monochromatic light travels from one medium to another, its wavelength changes but frequency remains the same.

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The refractive index of diamond is much greater than that of glass. How does a diamond cutter make use of this

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If a ray of light propagates from a rarer to a denser medium, how does its frequency

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State the criteria for the phenomenon of total internal reflection of light to take

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A lens behaves as a converging lens in air and a diverging lens in water (`mu`=4/3). What will be the condition on the value of refractive index (`mu`) of the material of the

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A converging lens axially in contact with a diverging lens; both the lenses being of equal focal lengths. What is the focal length of the

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A glass lens of refractive index 1.45 disappears when immersed in a liquid. What is the value of refractive index of the

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Calculate the speed of light in a medium whose critical angle is

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Why does the sky appear

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Under what condition does the formation of rainbow

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Two thin lenses of power + 6D and -2 D are in contact. What is the focal length of the

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Two thin lenses of power + 4 D and -2 D are in contact. What is the focal length of the

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Two thin lenses of power + 5 D and -2 .5 D are in contact. What is the focal length of the

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Why are convex mirrors used as side view mirrors in

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You are given two converging lenses of focal length 1.25 cm and 5 cm to design a compound microscope. If it is desired to have a magnification of 30, then find out the separation between the objective and

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