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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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A small telescope has an objective lens of focal length 150 cm and eyepiece of focal length 5 cm. What is the magnifying power of the telescope for viewing distance objects in normal adjustments. If this telescope is used to view a 100 m tall tower 3 km away, then what is the height of the tower formed by the objective

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Use the mirror equation to show that on object placed between F and 2F of a concave mirror produces a real image beyond 2

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Two monochromatic rays of light are incident normally on the face AB of an isosceles right-angled prism AB C. The refractive indices of the glass prism for the two rays 1 and 2 are respectively 1.35 and 1.45. Trace the path of these rays after entering through the prism.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A ray of light falls on a transparent sphere with centre C as shown in the figure. The ray emerges from the sphere parallel to the line AB. Find the angle of refraction of A if the refractive index of material of sphere is

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Figure shows a ray of light passing through a prism. If the refracted ray QR is parallel to the base BC, show that (i) `r_1= r_2 = A/2` and (ii) Angle of minimum decoration, `D_m = 2i —

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Write the conditions for observing a rainbow. Show by drawing suitable diagram how one understands the formation of a

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A ray PQ is incident normally on the face AB of a triangular prism of refracting angle of 60° made of a transparent material of refractive index `2/sqrt3` as shown in the figure. Trace the path of the ray as it passes through the prism. Also, calculate the angle of emergence and angle of deviation.

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A convex lens of focal length `f_1` is kept in contact with a concave lens of focal length `f_2`. Find the focal length of the

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When monochromatic light travels from a rarer to a denser medium, explain the following giving reasons. (i) Is the freguency of reflected and refracted light same as the frequency of incident light?(ii) Does the decrease in speed imply a reduction in the energy carried by light

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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